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19 Sal, girl = Vo(w), promise (endless = drop the last letter). Salvo, round of applause.

16 Scribe, writer, lose the first letter, with Bag, to shoot, going inside

Crib bag e. Cribbage, game.

9. The tarantella is a dance once thought a remedy for a tarantula bite (per Chambers)

That's great, thanks for the replies.

Chambers entry for “tarantism”

tarˈantism noun (med hist)
An epidemic dancing mania esp prevalent in S Italy from 15c to 17c, popularly thought to be caused by the tarantula bite

19d. Endlessly holding up plant
NIGELLA

2d. Book found in cathedral around beginning of last month
DUODECIMO

28a. Blues in Mondrian's Broadway painting
BOOGIE-WOOGIE

23d. Virile eccentric going over house
MACHO

21d. Dedicated person departed after broadcast
OBLATE

25d. Good movement could make this person start afresh
BEING

Parses for the above please.

21 Oblate, dedicated person (religious stuff). Ob - OB,Outside Broadcast, and Late departed, dead.

2 Duodecimo, book, (formed of sheets to make 12 leaves.) Duomo = cathedral, famous Italian ones, and Dec 1 is beginning of (the) last month.

19 ALLEGIN(g) upwards (not convinced)
2d I just see DEC for last month
28 BOOGIE-WOOGIE BROADWAY is a Mondrian painting, in MOMA
23 CAM is an eccentric (wheel) backwards, then HO for HOUSE
21 OB is Outside Broadcast, LATE is departed
25 BEGIN with the G moving - dreadful clue!

19d. Reversal of allegian(t) or allegian(ce) I think
2d. The cathedral is the Duomo (in Milan) around Dec 1st

Sorry scrap my 19d, Chris has it right I think. To allege is to hold