Crossword Genius

Beer container, almost dry, left (6)

Ross

I believe the answer is:

barrel

I'm a little stuck... Click here to teach me more about this clue!

'beer container' is the definition.
(I've seen this before)

'almost dry left' is the wordplay.
'almost dry' becomes 'barre' (I can't justify this - if you can you should believe this answer much more).
'left' becomes 'l' (common abbreviation).
'barre'+'l'='BARREL'

Can you help me to learn more?

(Other definitions for barrel that I've seen before include "Measure of oil" , "Beer measure; gun part" , "Oil or beer container" , "full of laughs?" , "Round wooden vessel." .)

I've seen this clue in The Sun.
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