Incline, you say, to agree (6)
I believe the answer is:
assent
'agree' is the definition.
(assenting is a kind of agreeing)
'incline you say' is the wordplay.
'incline' becomes 'ascent' (ascent is a kind of incline).
'you say' indicates a 'sounds like' (homophone) clue.
'ascent' sounds like 'ASSENT'.
'to' acts as a link.
(Other definitions for assent that I've seen before include "Say yes" , "Agree and concur" , "Acquiescence" , "Compliance, agreement" , "Official sanction" .)