ACROSS
7 - First one can change the attitude briefly as not being flexible (8) - {ADAM}{ANC*}{Ego}
9 - High time during the day (6) - TWELVE [CD]
11 - As a rule the frequent visitor is a bit lonely at the far end of the city (9) - {REGULAR}{L}{Y}
12 - Starts premium lounges at Zambia airport square (5) - {P}{L}{A}{Z}{A}
13 - Reveal oneself when five get together (6) - {E}{MERGE} 'E' being the fifth letter?
14 - Five plunge in after dusk following the river animal (8) - {AAR}{D{V}ARK}
17 - Cone shaped mass will reduce the flashlight in Israel on us (9) - {STROBe}{IL}{US}
22 - Eccentric sailor has body temperature of 98.6 degrees (8) - {AB}{NORMAL}
23 - Get up to tear it out (6) - ATTIRE*
25 - Plans areas for some edible fruit (5) - LANSA [T]
27 - Barmen go in a tizzy over the first Aussie flyer (9) - {BO{O}MERANG*}From where did the second 'O' come? (See comments)
28 - Submit the second point initially raised about the tanker (6) - {BOW}{S}{E}{R}
29 - Wise up to adapt the stratagem not accepted (3,5) - GET SMARTa*
DOWN
1 - Plastic bag is in the vehicle (7) - CARRIER [DD] ?
2 - Complicated mass of things (7) - TANGLED or TANGLES [CD] ?
3 - The fruit of the oak (5) - ACORN [E]
4 - To exchange, barter or trade (4) - SWAP [E]
5 - Mater can go up with the register (7) - {ALMA}{NAC<-} How are we to derive that 'Alma' comes from Alma-mater?
6 - Statements of soldiers indicate at ending wars (7) - {RE}{MARK}{S}
8 - Energetic reptile ate gorilla out in the east (9) - ALLIGATORe* Energetic?
10 - Lively princess is around the borders of Yemen in a morning college (7) - {D{YemeN}{AM}I}{C}
15 - Certainly the Tibetan leader is in to increase the sizes of banks (9) - {DOUB{T}LES}SWhere does the second 'S' come from? (Addendum - {DOUB{T}LE}{SizeS} - See comments}
16 - Resin company of father mostly is in the British area front (7) - {CO}{PA}{Is}{B}{A}
18 - Animal is on the parapet in the lane (7) - {WALL}A{BY} Anno pending
19 - Foreign university is new on the map (7) - {U}{N}{KNOWN} 'known' - 'on the map' ?
20 - Sound of falling rain (3-1-3) - PIT-A-PAT [E]
21 - Soundly stands by the scale readings (7) - WEIGHTS(~waits)
24 - Dry the designed robes (5) - SOBER*
26 - Head off for the laden Yemeni port (4) -lADEN
7 - First one can change the attitude briefly as not being flexible (8) - {ADAM}{ANC*}{E
9 - High time during the day (6) - TWELVE [CD]
11 - As a rule the frequent visitor is a bit lonely at the far end of the city (9) - {REGULAR}{L}{Y}
12 - Starts premium lounges at Zambia airport square (5) - {P}{L}{A}{Z}{A}
13 - Reveal oneself when five get together (6) - {E}{MERGE} 'E' being the fifth letter?
14 - Five plunge in after dusk following the river animal (8) - {AAR}{D{V}ARK}
17 - Cone shaped mass will reduce the flashlight in Israel on us (9) - {STROB
22 - Eccentric sailor has body temperature of 98.6 degrees (8) - {AB}{NORMAL}
23 - Get up to tear it out (6) - ATTIRE*
25 - Plans areas for some edible fruit (5) - LANSA [T]
27 - Barmen go in a tizzy over the first Aussie flyer (9) - {BO{O}MERANG*}
28 - Submit the second point initially raised about the tanker (6) - {BOW}{S}{E}{R}
29 - Wise up to adapt the stratagem not accepted (3,5) - GET SMART
DOWN
1 - Plastic bag is in the vehicle (7) - CARRIER [DD] ?
2 - Complicated mass of things (7) - TANGLED or TANGLES [CD] ?
3 - The fruit of the oak (5) - ACORN [E]
4 - To exchange, barter or trade (4) - SWAP [E]
5 - Mater can go up with the register (7) - {ALMA}{NAC<-} How are we to derive that 'Alma' comes from Alma-mater?
6 - Statements of soldiers indicate at ending wars (7) - {RE}{MARK}{S}
8 - Energetic reptile ate gorilla out in the east (9) - ALLIGATOR
10 - Lively princess is around the borders of Yemen in a morning college (7) - {D{Y
15 - Certainly the Tibetan leader is in to increase the sizes of banks (9) - {DOUB{T}LES}S
16 - Resin company of father mostly is in the British area front (7) - {CO}{PA}{I
18 - Animal is on the parapet in the lane (7) - {WALL}A{BY} Anno pending
19 - Foreign university is new on the map (7) - {U}{N}{KNOWN} 'known' - 'on the map' ?
20 - Sound of falling rain (3-1-3) - PIT-A-PAT [E]
21 - Soundly stands by the scale readings (7) - WEIGHTS(~waits)
24 - Dry the designed robes (5) - SOBER*
26 - Head off for the laden Yemeni port (4) -