Another one that's rather struggle!
However I've reduced it to the bottom right corner, where I still have a few posers:
49A - Single-handed, US Navy specialist joins battle: a star! (8, 4)
?O?O?O?? ????
37D - During miniature escapade request poem (2, 1, 7)
T? ? ?K?????
&
38D - on behalf of old teacher, appeal rejected with greatest force (10)
???T?????O
Assistance with these may help me with the remainder