Inclination to write vocal music (8)
I believe the answer is:
penchant
'inclination' is the definition.
(a penchant for something is an inclination for it)
'write vocal music' is the wordplay.
'write' becomes 'pen' (synonyms).
'vocal music' becomes 'chant' (I've seen this before).
'pen'+'chant'='PENCHANT'
'to' is the link.
(Other definitions for penchant that I've seen before include "Partiality" , "Strong liking, inclination" , "Disposition" , "Inclination, bent" , "Predilection, preference" .)