Solution to 21D has been deliberately left unsolved and is to be answered 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 Revise possible action leading to clash (11) ALTERCATION {ALTER}{ACTION*}
7 Woman starts speaking of women (3) SOW Acrostic
9 So long for a gold plated cube (5) ADIEU {A{DIE}U}
10 Move to permit one in ten, perhaps (2,7) EN PASSANT {PASS}{AN} in {TEN}*
11 Psychological baggage of one pound - like accepting separate review (9) ALBATROSS {A}{LB}{A{SORT<=}S}
12 Senseless when an invitation is rejected partly (5) INANE [T<=]
13 A pitch to remove nail polish (7) ACETONE {ACE}{TONE}
15 Here and there - again they all end in paradise (4) EDEN Tail Acrostic
18 Crazy over knock out (4) STUN<=
23 Subject revised within a month (5) OMANI [T<=]
26 Changed mind to take part in club game (9) BADMINTON {BA{MIND*}TON}
28 Noise from God dispensing love (3) DIN oDIN
29 Free to recall name - police department retains head (11) EMANCIPATED {NAME<=}{CI{PATE}D}
DOWN
1 Indian politician repeatedly picks up Chinese grass (4-4) AGAR-AGAR {RAGA}{RAGA}<=
6 New wine overhead shows bad quality (9) NASTINESS {N}{ASTI}{NESS}
7 Healer is a fake one (6) SHAMAN {SHAM}{AN}
8 Disappear after accompanying the Queen (6) WITHER {WITH}{ER}
14 Nothing good about slight intrusion - it's a precarious situation (2,4,3) ON THIN ICE {O}{N{THIN}ICE}
16 It comes to grip with tragic ending of the poor and destitute (8) INDIGENT {I{ENDING*}T}
17 Favourite looked sad to begin with (4-4) BLUE-EYED {EYED}<=>{BLUE}
20 As nice as fantastic run through (7) ARSENIC {NICE+AS}* over {R}
21 Can swing both ways in bar - stop it (6) ?O?B?D (Addendum - FORBID {FOR{BI}D} - See comments)
22 Agree music is uplifting - come again? (6) PARDON {NOD}{RAP}<=
25 Best opening line inside bar (5) ESTOP [T]
Reference List
Cube = DIE, Head = PATE, Power = P, New = N, Head = NESS, Queen = ER, Hard = H, Run = R


