After a struggle, takes naps on air (6)
I believe the answer is:
wrests
'takes naps on air' is the definition.
'wrests' can be an answer for 'takes' (I've seen this before). I'm not certain of the 'naps on air' bit.
I don't understand how the remainder of the clue works.
(Other definitions for wrests that I've seen before include "Obtain by seizing forcibly or violently" , "Takes" , "Seizes forcibly" .)