Inclination to write slogan for supporters? (8)

I believe the answer is:
penchant
'inclination' is the definition.
(a penchant for something is an inclination for it)
'write slogan for supporters?' is the wordplay.
I cannot quite understand how this works, but
'write' could be 'pen' (synonyms) and 'pen' is present in the answer.
'slogan' could be 'chant' and 'chant' is present in the answer.
No letters remain.
This explanation may well be incorrect...
'to' acts as a link.
Can you help me to learn more?
(Other definitions for penchant that I've seen before include "Willingness" , "Predilection, preference" , "'Predilection, a strong liking (8)'" , "Inclination; taste" , "Strong liking, inclination" .)
