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Define part of week and finish (4,2,1,3)

Ross

I believe the answer is:

call it a day

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'finish' is the definition.
(thesaurus)

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

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(Other definitions for call it a day that I've seen before include "Abandon work for now" , "Stop work" , "announce decision to quit" , "Set the style for a 24-hour period" , "pack up" .)

I've seen this clue in The Daily Express.
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