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Knocks back Pedro Ximenez in Irish river bar (5)

Ross

I believe the answer is:

expel

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'bar' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

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(Other definitions for expel that I've seen before include "Drive out, banish" , "Eject (from school)" , "Discharge in disgrace" , "Get rid" , "Reject" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).
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