Result in changes for an overcoat (6)
I believe the answer is:
ulster
'an overcoat' is the definition.
(ulster is a kind of overcoat)
'result in changes' is the wordplay.
'result' can be anagrammed to 'ULSTER'.
Though, I am not clear how this is indicated.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for ulster that I've seen before include "Ancient northern Irish kingdom" , "former province of Ireland" , "Loose overcoat - result (anag)" , "Odd result for the North" , "Six, or nine, counties" .)