Stopping work and hitting the sack (10)

I believe the answer is:

retirement

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'the sack' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

(Other definitions for retirement that I've seen before include "Withdrawal" , "Going to bed? - I met renter (anag)" , "Time without any work being done" , "Period after finishing work" , "Seclusion; end of work" .)

I've seen this clue in The Times.

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