Have four left which I just can't see:
5a Insect's 22 (body part) with cover for a larger one (6) ??R?I?
5d Rivers rose so as to form subject of comedy (6) ??R?R?
16d Pass the Guardian's standard (6) ?O?O?R Is this GOMORR?
19d A year in prison's half wanting observation (6) S?YIN?
Thank you