Song for a worker on edge (6)
I believe the answer is:
anthem
'song' is the definition.
(anthem is a kind of song)
'worker on edge' is the wordplay.
'worker' becomes 'ant' (worker is a type of ant).
'on' is a charade indicator (letters next to each other).
'edge' becomes 'hem' (I've seen this in another clue).
'ant'+'hem'='ANTHEM'
'for a' acts as a link.
(Other definitions for anthem that I've seen before include "Uplifting song -- the man (anag)" , "The man for a rousing song" , "Church choral piece" , "Uplifting music" , "Choral work" .)