Liking to write slogan (8)
I believe the answer is:
penchant
'liking' is the definition.
(I know that penchant is a type of liking)
'write slogan' is the wordplay.
'write' becomes 'pen' (synonyms).
'slogan' becomes 'chant'.
'pen'+'chant'='PENCHANT'
'to' acts as a link.
(Other definitions for penchant that I've seen before include "Fondness (for) - bias (towards)" , "Leaning towards or liking for" , "weakness" , "Strong liking, inclination" , "Willingness" .)