Solution to 1A 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 Sounds like interest-free, blessed? (6) S?C?E? (Addendum - SACRED (~ sake rid) - See comments)
4 Falls miserably wearing fashionable clothing (4-4) HALF-SLIP {H{FALLS*}IP}
9 Some invigilator chides for bloomer (6) ORCHID [T]
12 Look for our chat show (8) DISCLOSE DISC{+lo-our)LOSE
13 Odd time to get off horse for grapevine (6) RUMOUR {RUM}{hOUR}
15 Say this when you are surprised or when you couldn't solve the crossword (5,4,2) WORDS FAIL ME [DD]
18 They carry babies with them - Bothersome toddlers mainly perhaps (7-2-2) MOTHERS-TO-BE {BOTHERSOME+To...s}*
21 Consumer's right recognized by court (6) CLIENT {C{LIEN}T}
22 Fresh Indian drink is taken through the mouth (8) ORIGINAL {OR{I}{GIN}AL}
24 Wife spent time with company's money for squawk box (8) INTERCOM {wINTER}{CO}{M}
25 It gives pleasure when bird cuddles chick heartily (6) HEROIN {HERO{chIck}N}
27 Till inside compounds in conflict (2,4) AT ODDS {A{TO}DDS}
DOWN
1 Climax of blue film at the beginning (8) SHOWDOWN {DOWN}<=>{SHOW}
2 Overconfident Spooner's hit therapy (8) COCKSURE (~sock cure to cocksure)
3 Special beedis with finishing touch of herbal. They are fit for consumption (7) EDIBLES {BEEDIS+h...aL}*
5 Unfortunately, model leaves Titan (4) ALAS AtLAS
6 An unsuccessful person just cuts short, come-on! (7) FAILURE {FAIr}{LURE}
7 Will one heartless criminal keep out of sight? (3,3) LIE LOW {WILL+OnE}*
8 Safe bet finally won by counterpart (5) PETER {PE{beT}ER}
11 Mind-reading skill of editorial essence, it is useful in making paper (7) ESPARTO {ESP}{ART}{e..tOr..l}
16 It is borrowed from another language after resolving an old row (4-4) LOAN-WORD*
17 Says no to drinks initially coming with fake license (8) DECLINES {Dr...s}{LICENSE*}
18 Catch phrase by soft seductive woman (7) MANTRAP {MANTRA}{P}
19 Table, most comfortable, not new (7) SUGGEST SnUGGEST
20 Pine tree cut perhaps for one who consumes selectively (6) DIETER {DIE}{TREe*}
Reference List
Fashionable = HIP, King = K, Female = F, Look = LO, Horse = H, Court = CT, Indian = I, Wife = W, Company = CO, Money = M, Till = TO, Model = T, Soft = P, New = N