Solution to 17D has been deliberately left unsolved and is to be answered only by a non-regular / novice commenter, with proper annotation. Those who have answered earlier in the week, please give others a chance.
Open for anyone to answer, if not solved by 1 PM.
ACROSS
1 Cook tenderising things that go into the dish (11) INGREDIENTS*
7 Wild animal losing tail to a snake (3) BOA BOAr
10 A time to enter places of worship for models (9) TEMPLATES {TEMPL{A}{T}ES}
11 Youth in same building as Casanova? (6,3) LADIES MAN {LAD}{IN+SAME}*
12 Italian poet's escort without name (5) DANTE {DA{N}TE}
13 ''Rat running in drains" — they ruled (7) SATRAPS {SA{RAT*}PS}
15 Returned some of the personal effects in style (4) ELAN [T<=]
18 Drink quietly at the back (4) RUMP {RUM}{P}
20 Light on the run wearing pant (3,4) GAS LAMP {GAS{LAM}P}
23 Quick attack took place initially (5) RAPID {RA{Pl..e}ID}
24 A country with one million inhabitants shows vitality (9) ANIMATION {A}{N{1}{M}ATION}
26 Criminal changing a group of prisoners (5,4) CHAIN GANG*
27 Sound from mouth? (5) INLET [DD]
28 Comfort — losing one to reach God (3) SOL conSOLe How is C deleted? (Correction - SOLace - See comments)
29 Choose arrangement below the equipment on board (4,7) ECHO SOUNDER {CHOOSE*}{UNDER}
DOWN
1 "Romantic exchange between eyes" they said by the way (8) IDEALIST {(~eye)I}{DEAL}{(~eye)I}{ST}
2 Idly I get moving — in a frigid state (8) GELIDITY*
3 Look around Rhode Island for an elevated place to live (5) EYRIE {EY{RI}E}
4 Panama, say, is so full of maidens (7) ISTHMUS {IS}{TH{M}US}
5 Contestant — one could be around the pit (7) NOMINEE {NO{MINE}E*}
6 Alleges a boy died in his youth (5,4) SALAD DAYS {S{A}{LAD}{D}AYS}
7 Used a tube to fill Nitrogen gas (6) BUTANE {A+TUBE}* over {N}
8 Andrew's name came up as part of response (6) ANSWER ANdREWS* How is D delted?Anind? (Addendum - [T<=] - See comments)
14 A roll and twirl, that's plenty (9) ABUNDANCE {A}{BUN}{DANCE}
16 Rang about 6 and complained (8) CAVILLED {CA{VI}LLED}
17 First person refused- not for one remaining single (8) ?P?N?T?R (Addendum - SPINSTER {fIrST+PERSoN}* - See comments)
19 He ruled drug industry is losing money, sound surprised? (7) PHARAOH {PHARmA}{OH}
20 Americans in Mexico leave, happy faces all around (7) GRINGOS {GRIN{GO}S}
21 Gets ready with supports (6) BRACES [DD]
22 Buckles up, top line to stretch out (6) SPRAWL {WARPS<=}{Line}
25 Stop gold plating for so long (5) ADIEU {A{DIE}U}
Reference List
Base = E, Time = T, Name = N, Quietly = P, Million = M, Way = ST, Maiden = M, Died = D