Crossword Genius

Current beer available in bar? (7)

Ross

I believe the answer is:

draught

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'current' is the definition.
(a draught is a current of air)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for draught that I've seen before include "ship needs so much water?" , "(Of beer) sold from the cask" , "Cool air current indoors" , "air moving" , "unwelcome arrival under the door?" .)

I've seen this clue in the Sydney Morning Herald.
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