He is likely to resort to flight (6)
I believe the answer is:
airman
'he is likely to resort to flight' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'he is' is the wordplay.
I cannot really understand how this works, but
'he' could be 'man' (I've seen this in another clue) and 'man' is present in the answer.
The remaining letters 'air' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for airman that I've seen before include "Pilot" , "Marina (anag)" , "Male flyer" , "crew member" , "Flier" .)