Get rid of potatoes in this, maybe (4)

I believe the answer is:

sack

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'get rid of' is the definition.
(as in sacking a worker)

I can't explain the remainder of the clue.

(Other definitions for sack that I've seen before include "Fire - old Spanish wine" , "Large bag; dismiss" , "Receptacle" , "destroy > 50s dress" , "A bag for Falstaff's drink" .)

I've seen this clue in The Irish Times.

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