Bridge player in Bristol affected by Brexit split (4)

I believe the answer is:

east

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'bridge player' is the definition.
(name given to one player in the card game bridge)

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

Can you help me to learn more?

(Other definitions for east that I've seen before include "To right if facing North" , "Airport near Derby" , "E" , "Direction taken when going from the US towards Ireland" , "Oriental lands" .)

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