I'm stumped by one complete corner of this crossword, so I have little to offer by way of letters.
12D Everything up in the grove to fall to earth (8) - - - - - P _ E (second letter might be O)
18A Fellows who correspond with hire purchase traders (8)
- - - - -M - N (The M and N are very suspect but I'm guessing it must be MEN)
9D Joy accompanies the vocalist (4,6) G - E - / _ _ _ _ E _
(First letter of second word could be S)
15A Makes a pledge as drinks go round (6) _ _ _ _ S _ . If this is TOASTS it accounts for the O in 12D and the S in 9D.
Hope that is not too confusing.