Musical composition makes me no poet (4,4)
I believe the answer is:
tone poem
'musical composition' is the definition.
(tone poem is a kind of musical composition)
'makes me no poet' is the wordplay.
'makes' indicates anagramming the letters.
'me'+'no'+'poet'='menopoet'
'menopoet' with letters rearranged gives 'TONE-POEM'.
(Other definitions for tone poem that I've seen before include "Work" , "Story-based orchestral piece" , "Orchestral piece often on a literary theme" .)