Bag a bed (4)

I believe the answer is:

sack

I believe this clue is a double definition.

'bag' is the first definition.
(both can mean a container)

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

(Other definitions for sack that I've seen before include "Plunder; wine; bag" , "A bag for Falstaff's drink" , "Fire - plunder and destroy" , "It carries coal" , "Container for coal etc" .)

I've seen this clue in The Guardian.

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