The man composed song (6)
I believe the answer is:
anthem
'song' is the definition.
(anthem is a kind of song)
'the man composed' is the wordplay.
'composed' indicates an anagram.
'the'+'man'='theman'
'theman' is an anagram of 'ANTHEM'.
(Other definitions for anthem that I've seen before include "Religious chant" , "The man for a popular song" , "Church choral piece" , "Uplifting song -- the man (anag)" , "Uplifting music" .)