Crossword Genius

Go out to lunch when retired (4)

Ross

I believe the answer is:

stab

'go' is the definition.
(both can mean an attempt)

'out to lunch when retired' is the wordplay.
'out to lunch' becomes 'bats' (both can mean mad).
'when retired' is a reversal indicator.
'bats' in reverse letter order is 'STAB'.

(Other definitions for stab that I've seen before include "Puncture" , "Strike with knife" , "Pierce with a knife" , "Thrust (weapon into)" , "Twinge; guess" .)

I've seen this clue in The Guardian.
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