Model for top poetry composition (9)
I believe the answer is:
prototype
'model' is the definition.
(prototype is a kind of model)
'top poetry composition' is the wordplay.
'composition' indicates anagramming the letters (letters arranged or composed in a different order).
'top'+'poetry'='toppoetry'
'toppoetry' is an anagram of 'PROTOTYPE'.
'for' is the link.
(Other definitions for prototype that I've seen before include "Early model used for development" , "exemplar" , "Preliminary version from which other forms may be developed" , "First full-scale working model" , "Original model - top poetry (anag)" .)