I have a few answers that I dont understand , so any help with parsing would be gratefully received !
22 across ' nice gym likely to collapse without stanchion at the back (10) '
....the answer has already been given a couple of times as 'pernickety' , i see how you used 'pe' for gym and 'rickety' for likely to collapse , and maybe 'n' for nice but how does 'stanchion at the back' fit in ?
19 down ' Officer sweeping public common (7)'
... I have _ _N_R_L so have put 'general' which fits with 'officer' and 'common' , but why 'sweeping public' ?
18 across ' Plant that's muddy green or indigo , primarily (8) '
... I have_ R_G_R_N and assume it may be anagram of 'green or' + 'i' ??