“Saw” for “see” say (7)
I believe the answer is:
proverb
'saw' is the definition.
(a saw can mean a proverb or maxim)
'for see say' is the wordplay.
'for' becomes 'pro' (as in being 'pro' or in favour of something).
'see say' becomes 'verb' ('see' is a verb).
'pro'+'verb'='PROVERB'
(Other definitions for proverb that I've seen before include "Pithy saying expressing a general truth" , "Familiar saying" , "Saying of great truth" , "Wise saying" , "Generally true saying" .)