6 acts of kindness (7) 14 kings........ (film) (6) 16 keep this about you at this loch (7) 23 fastener abyss (10) 32 take this to be a nun (4) 40 little violet with automobile (5) 43 in don't argue argue standing there (5)
So you are saying it's:
10 American singer born 1978 (5)
12 ---blimey, a wise old man (7) - so CORSAGE will be right
29 wedding downpour (6,6) - so CONFETTI is wrong
41 Rehearsal, code, circle (5) - so DRESS will be right
Are you sure you have the letter counts for 10 and 29 the right way round. I'd expect the American singer born in 1968 to be something like 6,6 rather than 5- unless it's a rapper or someone else who goes by a one-word name