It’s in Brno, possibly, you’ll find an islander (6)
I believe the answer is:
briton
'an islander' is the definition.
(I've seen this before)
'it's in brno possibly' is the wordplay.
'it's' becomes 'it' (I've seen this in other clues).
'in' is an insertion indicator.
'possibly' indicates anagramming the letters.
'brno' is an anagram of 'bron'.
'it' inserted into 'bron' is 'BRITON'.
'you'll find' is the link.
(Other definitions for briton that I've seen before include "Inhabitant of England, perhaps" , "UK citizen" , "Native of England, Wales or Scotland" , "Citizen of our next-door neighbour" , "one of us" .)