Part poet's hair (9)
I believe the answer is:
sideburns
'hair' is the definition.
(I've seen this before)
'part poet's' is the wordplay.
'part' becomes 'side' (side is a kind of part).
'poet' becomes 'burns' (Scottish poet Robert Burns).
'side'+'burns'='SIDEBURNS'
(Other definitions for sideburns that I've seen before include "hirsute growth" , "Cheeky display" , "Hair" , "temple adornments" , "Facial whiskers" .)