Won't change settlement (4)
I believe the answer is:
town
'settlement' is the definition.
'won't change' is the wordplay.
'change' indicates an anagram.
'wont' is an anagram of 'TOWN'.
(Other definitions for town that I've seen before include "Small urban development" , "Borough" , "Milton Keynes, say, with 1a [NEW]" , "Densely populated area" , "Carmathen?" .)