Saw Bill cycle (5)
I believe the answer is:
adage
'saw' is the definition.
(saw can mean a proverb or saying)
'bill cycle' is the wordplay.
'bill' becomes 'ad' (advertisement stuck on wall).
'cycle' becomes 'age' (I've seen this in another clue).
'ad'+'age'='ADAGE'
(Other definitions for adage that I've seen before include "Short statement expressing a general truth" , "Dictum" , "Old saying, maxim" , "Old saw" , "True proverb or saying" .)