Use a kind of bag or barrel, perhaps (4)

I believe the answer is:

cask

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'barrel perhaps' is the definition.
'cask' can be an answer for 'barrel' (I've seen this in another clue). I am not sure about the 'perhaps' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for cask that I've seen before include "Drink here" , "Wine barrel" , "Wine vessel; sack (anag.)" , "VAT?" , "large volume of beer" .)

I've seen this clue in The Irish Times.

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