An Italian poet's musical movement (7)
I believe the answer is:
andante
'musical movement' is the definition.
'andante' can be an answer for 'movement' (I've seen this before). I also know that 'musical' relates to this answer.
'an italian poet's' is the wordplay.
'italian poet' becomes 'dante' (Dante Alighieri).
'an'+'dante'='ANDANTE'
(Other definitions for andante that I've seen before include "Slow, even time (mus.)" , "Unhurried pace" , "Moderately slow movement" , "(Of tempo) moderately slow" , "Moderately slow musical passage" .)