Crossword Genius

Old saw that's lost its edge? (6)

Ross

I believe the answer is:

cliche

'old saw' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

(Other definitions for cliche that I've seen before include "Banal phrase" , "Phrase made tedious through repetition" , "Truth uttered so often as to become boring" , "One by one" , "Saying made tedious through repetition" .)

I've seen this clue in The Sun and The Times.
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