Further trouble following Brexit! (5)
I believe the answer is:
other
'further' is the definition.
(synonyms)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for other that I've seen before include "Alternative - unrelated" , "Alternate; additional" , "Different (from those mentioned)" , "Remaining" , "Not the one mentioned" .)