ACROSS
1 - Tax mine manager for collecting filthy water in a pool (7) - {CESS}{PIT}
5 - Nothing new about her being shown out (7) -{US{HER}ED}
9 - In Paris it's fashionable (1,2,4) - A LA MODE [E]
10 - I roll round to have merry time (7) - {RO{I}STER}
11 - Ideas that may blossom her (5) - SADIE*
12 - Flirting expected in dead marriage (9) -{D}{ALLIANCE}
13 - Disparage – and not for good measure! (4,5) - SELL SHORT [DD]
15 - Freedom from disturbance (5) -PEACE [E]
16 - A call for trumps may dwindle away to nothing (5) - PETER [DD]
18 - Quality best in the long run (9) - ENDURANCE &lit
21 - Detained foreigners seen returning to Bury (9) - {INTER}{NEES<-}
24 - Am leaving USA for her (5) -
25 - Mad Eden needs to be corrected (7) - AMENDED*
26 - They constantly worry when gangs roaming round return (7) - {NAGG{ER<-}S*}
27 - Made safe by arranging English nurse (7) - {ENSURE*}D How did the D get in?
28 - They find they've achieved their aim (7) - SEEKERS [CD]
DOWN
1 - Frame the fool the companion is having imprisoned (7) - {CH}{ASS}{IS}
2 - Can get the youths to cover up the disgraceful behaviour (7) - {S{CAN}DAL<-}
3 - Computer centre for a production line worker (9) - PROCESSOR [DD]
4 - Right to end turn towards general tendency (5) - {TR<-}{END}
5 - Run amok in high spirits, but that is not to the point (9) -{UNR*}{ELATED}
6 - She may hide around a building, but you'll see her (5) -{HE{I}DI*}
7 - Building's large cask is in road – broken (7) - {RO{TUN}DA*}
8 - Leader takes direction and makes efforts to search for her (7) -{DARLEN*}{E}
14 - Without determination the golfing event finished (4,5) - {OPEN} {ENDED}
15 - Not a good hunting dog, it's said; rather a shark (9) - {~poor){POR}{BEAGLE}
16 - Proper tea, brewed by one of us (7) -{PRIM}{ATE*}
17 - Any old rubbish will interest them, they add (7) -TOTTERS [DD]
19 - An un-English gullibility (7) -NAIVETE [CD]
20 - In the confusion Lee does pass silently and slips away (7) - ELAPSES*
22 - Radio pulses to locate objects (5) - RADAR [CD}
23 - Ned on board ship rouses one to ecstasy (5) - {S{END*}S}