Meet flying fist for one is boxing (7)
I believe the answer is:
satisfy
'meet' is the definition.
(I know that meet can be written as satisfy)
'flying fist for one is boxing' is the wordplay.
'flying' indicates anagramming the letters (letters fly around into new positions).
'for one' becomes 'say' (both can mean 'for example').
'is boxing' is an insertion indicator ('box' can mean contain, as in to put in a box).
'fist' is an anagram of 'tisf'.
'tisf' inserted into 'say' is 'SATISFY'.
(Other definitions for satisfy that I've seen before include "Meet (requirements)" , "pay in full" , "Meet a want or need" , "Content" , "Fulfil requirements" .)