Crossword Genius

To quit is no longer the thing (4)

Ross

I believe the answer is:

exit

'to quit' is the definition.
(thesaurus)

'no longer the thing' is the wordplay.
'no longer' becomes 'ex' (prefix meaning former or onetime).
'the thing' becomes 'it'.
'ex'+'it'='EXIT'

'is' is the link.

(Other definitions for exit that I've seen before include "[DOOR] ?" , "Escape route?" , "Leave the stage" , "Way out sign" , "Withdrawal" .)

I've seen this clue in the Evening Standard.
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