Solution to 25A 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 solve, if not solved by 1 PM.
ACROSS
1 Angrily pursues groper in lobby (8,5) PRESSURE GROUP*
9 Setting aside whiskey, brewed soup somehow and became less drunk (7,2) SOBERED UP {BREwED+SOUP}*
11 Revealed throttling worker close to seedy bar in deprived area (10) SHANTYTOWN {SH{ANT}{s..dY}{T}OWN}
12 Sweetheart's a little lustful after back massage (4) GIRL {Lu...l}<+>{RIG}
14 Sick critic taking drug is suffering from jaundice (7) ICTERIC {ICT{E}RIC*}
16 Fruits in field eaten by boys regularly (7) ORANGES {bO{RANGE}yS}
19 Turn tight, knocking back wine (7) MEANDER {MEAN}{RED<=}
21 Guy removing top is fit (4) ABLE cABLE
22 Shooter's target is set with beast getting close, finally drawn in by trick (4,6) CLAY PIGEON {C{LAY}{PIG}{c..sE}ON}
25 Fascinated by sign above fourth doorway? (9) E?T?A?C?D (Addendum ENTRANCED {ENTRANCE D} - See comments)
27 Sending to infirmary in ship, isolating at sea (13) HOSPITALISING*
DOWN
3 Dirty secret about last leader of Nigeria (10) SLATTERNLY {S{LATTER}{Ni...a}LY}
4 Loose nuts holding framework, essentially not yet fixed (5) UNSET {UNS{f..mEw..k}T*}
5 Space below new elevated dock (5,4) ELBOW ROOM {BELOW*}{MOOR<=}
6 Exceptional opening of restaurant for fine food (4) RARE (+r-f)RARE
7 Weakness is constant, taking oxygen for malady finally (7) UNDOING UND(-y+o)OING
8 Composed neat, precise words of farewell (4,2,5) REST IN PEACE*
10 What guitarist might do to use influence (4,7) PULL STRINGS [DD]
13 Disasters start to increase as climate changes (10) CALAMATIES {In...e+AS+CLIMATE}*
15 Company member permitted to tackle president involved with others in law-breaking (9) COMPLICIT {CO}{M}{LICIT} over {P}
18 Very perverse loony grabbing model close to studio (4,3) ONLY TOO {LOONY}* over {T}{s...iO}
23 Entertaining retro party, endlessly shout and sing with rapidly changing pitch (5) YODEL {Y{DO<=}ELl}
24 Saw a spider trapping insect (4) WASP [T]
Reference List
Whiskey = W, Bar = T, Drug = E, Angular momentum = L, Mass = M, Prince = P, Fine = F, Company = CO, member = M, President = P, Model = T, Party = DO