Unwilling to make up a piece of poetry (6)
I believe the answer is:
averse
'unwilling' is the definition.
(I've seen this before)
'a piece of poetry' is the wordplay.
'piece of poetry' becomes 'verse' (I've seen this in another clue).
'a'+'verse'='AVERSE'
'to make up' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for averse that I've seen before include "Having a strong opposition (to)" , "Disinclined, loath" , "Antipathetic" , "Metal rod; card game" , "A piece of poetry is reluctant" .)