Old saying
'old saying' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for adage that I've seen before include "Axiom" , "say it again and again!" , "Slogan" , "True proverb or saying" , "Maxim, aphorism" .)
'old saying' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for saw that I've seen before include "Cutting tool or old saying" , "Noticed - tool" , "Wise old saying about a tool" , "Old saying with teeth" , "Pithy saying" .)