Solution to 7D 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 Go back to steal from oriental closet (8) WARDROBE {DRAW<=}{ROB}{E}
5 Problem mastering some subsidiary propositions (6) LEMMAS [T]
10 Shame about member getting absolute power (7) STAMINA {STA{M}IN}{A}
11 Encircle tortuous vein on radius (7) ENVIRON {VEIN+ON+R}*
14 Little chance of finishing soon? Sigh! (2,3,2,5) NO END IN SIGHT {SIGHt} Rebus
18 Pair agree on going astray with many in this? (4,8) OPEN MARRIAGE {PAIR+AGREE+ON+M}* Semi&lit
21 European star exercising after knocking back a drink in old Greek gymnasium (9) PALAESTRA {E}{STAR*}<=>{A LAP<=}
23 Greek character overwhelmed by viral pharyngitis (5) ALPHA [T]
24 Ran haphazardly during commotion in tempest (7) TORNADO {TO{RAN*}DO}
25 Toughening popular band consuming drugs at centre (7) INURING {IN}{drUgs}{RING}
26 Shelves with large borders (6) LEDGES {L}{EDGES}
27 Introduced new resident (8) INSERTED*
DOWN
1 Hunk hosting female freshened up (6) WASHED {WA{SHE}D}
2 Rise to embrace extremely desirable university lecturer (6) READER {REA{De...lE}R}
3 Managed to save one male crossing southern hill in deluge (9) RAINSTORM {RA{1}N}{M} over {S}{TOR}
4 Bohemian writers in club consuming ecstasy and dope are turning into rebels (4,10) BEAT GENERATION {B{E}AT}{GEN}{ARE<=}{INTO*}
7 Tense and quiet, crushed by additional loan (8) ?O?T?A?E (Addendum - MORTGAGE {T}{GAG} in {MORE} - See comments)
8 Disinfect article with iodine in case (8) SANITATE {S{AN}{I}TATE}
9 Restoration of extremely ramshackle house outside Long Island (14) REHABILITATION {Ra...lE}{HABI{LI}TATION}
15 Distinctive mark of genius, art's remarkable (9) SIGNATURE*
16 Lots with a hip fracture here? (8) HOSPITAL {LOTS+A+HIP}* &lit
17 Sophisticated lady starts to laugh, becoming rather enthralled by marijuana (4-4) WELL-BRED {L}{La..h}{Be...g}{Ra...r} in {WEED}
19 Run special issue (6) SPRINT {S}{PRINT}
20 Bashed group grabbing girl on base (6) BANGED {BAN{G}{E}D}
22 Pick up rumour about onset of epidemic (5) ELATE {TALE<=}{Ep...c}
Reference List
Oriental = E, Member = M, Absolute = A, Radius = R, Prince = P, English = E, Many = M, European = E, Popular = IN, Large = L, Male = M, Southern = S, Hill = TOR, Ecstasy = E, College = C, Tense = T, Lady = L, Special = S, Girl = G, Base = E







