Coming back, piece of trifle's enough for me (7)
I believe the answer is:
oneself
'me' is the definition.
(I've seen this before)
'coming back piece of trifle's enough' is the wordplay.
'coming back' says the letters should be written in reverse.
'piece of' indicates a hidden word.
'fleseno' is hidden within 'trifles enough'.
'fleseno' reversed gives 'ONESELF'.
'for' acts as a link.
(Other definitions for oneself that I've seen before include "personally" , "Feels on (anag.)" , "By this, unaided" , "normal" , "Lose fen (anag)" .)