Crossword Genius

Bar, one offering pork pie that's been recalled (4)

Ross

I believe the answer is:

rail

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'bar' is the definition.
(rail is a kind of bar)

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

Can you help me to learn more?

(Other definitions for rail that I've seen before include "Complain bitterly - wading bird" , "Track - complain - bird" , "wader" , "Part of train track" , "Form of transport" .)

I've seen this clue in The Everyman puzzle in The Observer.
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