Struggle supported by Western opinion (4)
I believe the answer is:
view
'opinion' is the definition.
('view' can be a synonym of 'opinion')
'struggle supported by western' is the wordplay.
'struggle' becomes 'vie' (I've seen this before).
'supported by' says to put letters next to each other (letters go below - in down clue).
'western' becomes 'w'.
'vie'+'w'='VIEW'
(Other definitions for view that I've seen before include "Consider" , "Behold the scenery?" , "Range or field of vision" , "Survey - opinion" , "belief" .)