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29ac, 'Top mimic getting by', (4), A?E?;

36ac, 'Zoo punished by bishop, a dimwit, (4), ?O?O; DODO?

42dn, 'Irregular sampling of reef or mudflat', (4-4), ?R?E ?O?M;

45ac, 'Sea diver moped, perhaps disheartened', (6), ?C?T?R.

Not an easy crossword.

29a APEX
36a BOZO
42d FREEFORM - hidden in the clue
45a SCO(O)TER - a sea duck

Thank you.