British arrive at Split (6)
I believe the answer is:
breach
'split' is the definition.
(I've seen this before)
'british arrive' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'arrive' becomes 'reach' (reaching is a kind of arriving).
'b'+'reach'='BREACH'
'at' is the link.
(Other definitions for breach that I've seen before include "transgression" , "Gap made in a fortification" , "Contravention" , "Failure to carry out promise etc" , "part of firearm, say" .)