Crossword Genius

Succeed in cutting cocaine quietly in bar (5)

Ross

I believe the answer is:

expel

'bar' is the definition.
(both can mean to exclude)

I don't understand how the rest of the clue works.

(Other definitions for expel that I've seen before include "bar" , "Remove from membership" , "Drive away" , "Put out" , "Spew" .)

I've seen this clue in The Guardian.
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