Cryptic about two-thirds completed or maybe a bit more. I googled for one answer and a few synonyms, but that's fairly allowable I think!
However, a hint for a couple of the clues would be very helpful and much appreciated as always..
19 across: Loud noise having caught monkey eating duck (

Letters: - L - - - - s -
It's a clue that has come up before, and I know monkey means £500 and duck can have a variety of meanings which is probably 0 in this case, but the answer eludes me at the moment.
There is also
21 across: Government's leader in wrong job, one indicates (

Letters: First either S or R, more likely S I think, and 7th S