Move sack (5)

I believe the answer is:

shift

This clue is a double definition.

'move' is the first definition.
(shift is a kind of move)

'sack' is the second definition.
('shift' can be a synonym of 'sack')

(Other definitions for shift that I've seen before include "Switch" , "Move; straight dress" , "Time when group of people are working" , "Change (gear); dress" , "Alter" .)

I've seen this clue in The Telegraph.

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