I've changed to western outlook (4)
I believe the answer is:
view
'outlook' is the definition.
(I've seen this in another clue)
'i've changed to western' is the wordplay.
'changed' indicates an anagram.
'to western' becomes 'w'.
'ive' is an anagram of 'vie'.
'vie'+'w'='VIEW'
(Other definitions for view that I've seen before include "Natural scenery or mental attitude" , "Aspect - prospect" , "Range or field of vision" , "Prospect - opinion" , "inspection" .)