Cool diversion gets stale (3)

I believe the answer is:

old

'stale' is the definition.
(synonyms)

'cool diversion gets' is the wordplay.
'gets' says the answer is hidden in the clue.
'OLD' can be found hidden inside 'cool diversion'.

(Other definitions for old that I've seen before include "Advanced in years" , "Senescent" , "Elderly" , "SECOND PART OF 14" , "Stale" .)

I've seen this clue in The Mirror.

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