Not all newsagents look tired! (3)

I believe the answer is:

sag

'look tired' is the definition.

'not all newsagents' is the wordplay.
'not all' indicates a hidden word.
'SAG' can be found hidden inside 'newsagents'.

(Other definitions for sag that I've seen before include "Subsidence" , "Fail to retain interest" , "Decline" , "Cave in" , "Sinking" .)

I've seen this clue in the Evening Standard.

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