Verbal agreement for rise (6)
I believe the answer is:
ascent
'for rise' is the definition.
(synonyms)
'verbal agreement' is the wordplay.
'verbal' indicates a 'sounds like' (homophone) clue.
'agreement' becomes 'assent' (assent is a kind of agreement).
'assent' is a homophone of 'ASCENT'.
(Other definitions for ascent that I've seen before include "Mountain path" , "progress" , "Acclivity" , "Stance (anag)" , "advancement" .)