Solution to 8D 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.
ACROSS
9 Almost succeed in relaxing old BCCI regulations (excluding one) (5,3,2,5) CLOSE BUT NO CIGAR {O+BCCI+REGULATiONS}*
10 Grates for pickles (7) SCRAPES [DD]
11 Attempt to adopt elderly Devdas, for one (7) TRAGEDY {TR{AGED}Y}
12 Erstwhile British PM's sick after assembly (9) CHURCHILL {ILL}<=>{CHURCH}
17 Legendary being secure like setters (7) PEGASUS {PEG}{AS}{US}
21 Back America and free country (5) SUDAN {US<=}{AND*}
30 Less sensitive to go through cold and conservative lady's accountants, say (6,9) NUMBER CRUNCHERS {NUMBER}{C}{RUN}{C}{HERS}
DOWN
1 Winners run out of contests (4) ACES rACES
2 Gent keeping spectacles to fix (4) MOOR {M{OO}R}
3 Nags man softly blocking kisses (8) HENPECKS {HE}{N{P}ECKS}
6 Son climbing above edges slowly to scribble (6) SCRAWL (+s)SCRAWL(-s)
7 Monster starts to open ghastly red eyes (4) OGRE Acrostic
8 Row in fine stream (4) ?R?Y (Addendum - FRAY {F}{RAY} - See comments)
12 Heads of many monkeys (5) CAPES {C}{APES}
13 Pushed drug travelling around East (5) URGED {URG{E}D*}
15 Somewhat weak doves raising spirit (5) VODKA [T<=]
16 Currency including yen in den from South (5) RIYAL {RI{Y}AL<=}
20 Public hearing (8) AUDIENCE [DD]
22 Agreed to take up study drinking rum (6) NODDED {N{ODD}ED<=}
24 Regularly deflect return serve at line (6) AVENUE {rEtUrN+sErVe+At}<=
25 Running between players for ages (4) EONS {E}{ON}{S}
26 Song that guy heard (4) HYMN (~him)
28 Fired fellow deleted sent message (4) AXED fAXED
29 Mass entertainer (4) HOST [DD]
Reference List
Old = O, Criminal = AL(Capone), Liberal = L, Model = T, Husband = H, Cold = C, Conservative = C, Run = R, Spectacles = OO, Softly = P, Son = S, Many = C, East = E, Yen = Y, Players = E,s(East and South in card game Bridge), Fellow = F