Saw notice on time (5)

I believe the answer is:

adage

'saw' is the definition.
(saw can mean a proverb or saying)

'notice on time' is the wordplay.
'notice' becomes 'ad' (both can mean an advertisement).
'on' is a charade indicator (letters next to each other).
'time' becomes 'age' (an age is a period of time).
'ad'+'age'='ADAGE'

(Other definitions for adage that I've seen before include "Old saw" , "Old saying; proverb" , "Proverb expressing a general truth" , "Dictum" , "Maxim, aphorism" .)

I've seen this clue in The Globe and Mail, The Independent, The Guardian and The Telegraph.

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