Writer and Italian poet mostly hanging ornament (7)
I believe the answer is:
pendant
'hanging ornament' is the definition.
(I've seen this before)
'writer and italian poet mostly' is the wordplay.
'writer' becomes 'pen' (I've seen this before).
'and' is a charade indicator (letters next to each other).
'italian poet' becomes 'dante' (Dante Alighieri).
'mostly' means to remove the last letter.
'dante' with its last letter taken off is 'dant'.
'pen'+'dant'='PENDANT'
(Other definitions for pendant that I've seen before include "Panted after learned one" , "Ornament hanging from necklace" , "One hung by the neck" , "earring, say" , "Ornament hanging from a piece of jewellery" .)