Solution to 3D 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 Perhaps the curt city folk (6) ETHNIC {THE*}{NICe}
5 Drug seller is quick covering damage (8) PHARMACY {P{HARM}ACY}
9 Clueless Inspector General's tirade overwhelming new officer at first (8) IGNORANT {IG}{RANT} over {N}{Of...r}
10 Is this creator redesigning pantries? (6) PARENT {PARENT+IS}=PANTRIES [CA]
11 Surprisingly, strange associate quits subsequently in support (10) STRENGTHEN {STRaNGE}*{THEN}
12 Member cycling around a storm (4) GALE {(+g)GLE(-g)} over {A}
13 Like a stag, colony resident ogled - abandoning last trace of shame (8) ANTLERED {ANT}{LEeRED}
16 Hence the French people, heartless and glum (6) SOLEMN {SO}{LE}{MeN}
17 Florida completes uniformly chosen constructions (6) FRAMES {FloRidA+coMplEteS}
19 Most insensitive subset to bust (8) OBTUSEST*
21 Magnificent huskies smuggled in this manner (4) THUS [T]
22 Quarrelsome Finny ruled out (10) UNFRIENDLY*
25 Character without bit of loyalty and grace (6) FAVOUR FlAVOUR
26 In comparison, some vital errands partly withdrawn (8) RELATIVE [T<=]
27 Anxious playing drest repeatedly? (8) STRESSED DREST* [Letter Bank]
28 Come, rise, dance exhibiting revolutionary passion (6) DESIRE [T<=]
DOWN
2 Close tense contest! Missed the beginning (5) TIGHT {T}{fIGHT}
3 Discovered snoop uses net (5) N?O?E ()
4 German supporting family blunder (7) CLANGER {GER}<=>{CLAN}
5 Spotted Penny at church with journalist (7) PATCHED {P}{AT}{CH}{ED}
6 A lecturer flags plants (7) ALPINES {A}{L}{PINES}
7 Bloomers from post-graduate doctor and grey-haired saint (9) MARIGOLDS {MA}{RIG}{OLD}{S}
14 Point of Mathematician or the astronomer (9) NORTHEAST [T]
15 Rock's tipping point, Mark switching places with Lira (9) LIMESTONE (-m+l)LI(-l+m)MESTONE
18 Son leaves carrying revolver finally and shoots (7) SQUIRTS {S}{QUI{r...eR{TS}
19 Advanced deer? (7) OFFERED {DEER}* [RA]
20 Delighted Henry quit and laughed in a high-pitched voice (7) TRILLED ThRILLED
23 Records Spooner's accents (5) NOTES (tones to notes}
24 Celebrate climbing bar (5) LEVER<=
Reference List
New = N, Associate = A, The in French = LE, Tense = T, Penny = P, Church = CH, Journalist = ED(Editor), Lecturer = L, Post-Graduate = MA< Saint = S, Large = L, Mark = M, Lira = L, Son = S, Henry = H