Crossword Genius

Cask needing air to remove last of ale (3)

Ross

I believe the answer is:

tun

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

'cask' is the definition.
(I know that tun is a type of cask)

'air to remove last of ale' is the wordplay.
I cannot quite understand how this works, but
'last' could be 't' (I've seen this in other clues) and 't' is found within the answer.
The remaining letters 'un' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'needing' is the link.

Can you help me to learn more?

(Other definitions for tun that I've seen before include "Container of beer" , "Barrel holding many gallons" , "beer barrel" , "Large cask for liquid" , "Nut found in large cask" .)

I've seen this clue in The Times.
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