Get rid of bed (4)

I believe the answer is:

sack

This clue is a double definition.

'get rid of' is the first definition.
(I've seen this before)

'bed' is the second definition.
(e.g. 'in the sack')

(Other definitions for sack that I've seen before include "Flour or grain bag" , "Plundering of captured town" , "Container for coal etc" , "Elbow" , "Devastate" .)

I've seen this clue in The Guardian.

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