Escape trouble during fight (4,3)
I believe the answer is:
bail out
'escape' is the definition.
(I've seen this before)
'trouble during fight' is the wordplay.
'trouble' becomes 'ail' (synonyms).
'during' means one lot of letters goes inside another.
'fight' becomes 'bout' (as in a bout in boxing).
'ail' going inside 'bout' is 'BAIL OUT'.
(Other definitions for bail out that I've seen before include "Withdraw" , "Provide support" , "Rescue from trouble" , "extricate one from a difficult situation" , "finance in a tricky situation" .)