Crossword Genius

Further trouble following Brexit! (5)

Ross

I believe the answer is:

other

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'further' is the definition.
(synonyms)

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

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(Other definitions for other that I've seen before include "Alternative - unrelated" , "Alternate; additional" , "Different (from those mentioned)" , "Remaining" , "Not the one mentioned" .)

I've seen this clue in The Times and The Sunday Times.
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