Song the man composed (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' anagrammed gives 'ANTHEM'.
(Other definitions for anthem that I've seen before include "air of patriotism?" , "One for doomed youth" , "Solemn song" , "Song in praise of a nation" , "National or religious song" .)