Help appreciated with parsing for these......
20a. In brief, this state is fine (8) - OKLAHOMA - I thought this might be abbreviations of various states LA, MA and OK for 'Fine' but that leaves HO so I'm sure I'm sure I'm completely on the wrong track.
52a. Small and insignificant? Yes (6) - SLIGHT - This looks like S(mall) + LIGHT (Insignificant), but why the question mark and why 'Yes'?