British boxer comes to an island (4)
I believe the answer is:
bali
'an island' is the definition.
(Bali is an example)
'british boxer' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'boxer' becomes 'ali' (Muhammad Ali).
'b'+'ali'='BALI'
'comes to' acts as a link.
(Other definitions for bali that I've seen before include "Island in Indonesia" , "Holiday island to the east of Java" , "Bail out of the island" , "mountainous island" , "Indonesian island, capital Denpasar" .)