Strop made by part of fractious harp ensemble (7)
I believe the answer is:
sharpen
'strop' is the definition.
(I know that strop is a more specific form of sharpen)
'part of fractious harp ensemble' is the wordplay.
'part of' says the answer is hidden in the clue.
'SHARPEN' is hidden in the letters of 'fractious harp ensemble'.
'made by' is the link.
(Other definitions for sharpen that I've seen before include "Hone (a knife blade)" , "Make more acute" , "Restore edge to knife" , "Put a keen edge on" , "Raise pitch of" .)