Old broken slate (5)

I believe the answer is:

stale

'old' is the definition.
(similar in meaning)

'broken slate' is the wordplay.
'broken' indicates an anagram.
'slate' with letters rearranged gives 'STALE'.

(Other definitions for stale that I've seen before include "Lacking freshness" , "Least (anag.)" , "past the sell-by date" , "Mouldy or hackneyed" , "Boring" .)

I've seen this clue in the Evening Standard.

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