Amateur poet penning unusual title (10)
I believe the answer is:
dilettante
'amateur' is the definition.
(I know that dilettante is a type of amateur)
'poet penning unusual title' is the wordplay.
'poet' becomes 'dante' (13th- and 14th-century Italian poet).
'penning' means one lot of letters goes inside another.
'unusual' indicates an anagram.
'title' anagrammed gives 'ilett'.
'dante' placed around 'ilett' is 'DILETTANTE'.
(Other definitions for dilettante that I've seen before include "amateur artist" , "One dabbling" , "One with superficial knowledge" , "Arty type" , "Amateurish" .)