Dashing fist on a few (8)
I believe the answer is:
handsome
'dashing' is the definition.
(thesaurus)
'fist on a few' is the wordplay.
'fist' becomes 'hand' (I have seen 'Unclenched fist' mean 'hand' so perhaps 'fist' could also mean 'hand').
'on' means one lot of letters go next to another.
'a few' becomes 'some' (both can mean a small amount of something).
'hand'+'some'='HANDSOME'
(Other definitions for handsome that I've seen before include "Nice-looking" , "Fine-looking" , "'Good-looking, as a man might be (8)'" , "Attractive, liberal" , "Easy on the eye" .)