He may fly from Marian (6)
I believe the answer is:
airman
'he may fly' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'from marian' is the wordplay.
'from' indicates an anagram (the anagram comes from the same letters).
'marian' with letters rearranged gives 'AIRMAN'.
Can you help me to learn more?
(Other definitions for airman that I've seen before include "He flies" , "Marina (anag)" , "Pilot" , "Flier" , "Male flyer" .)