Struggle with objective opinion (9)
I believe the answer is:
viewpoint
'opinion' is the definition.
(I've seen this before)
'struggle with objective' is the wordplay.
'struggle' becomes 'vie' (to vie is to struggle or contend with).
'with' becomes 'w' (abbreviation).
'objective' becomes 'point' (I've seen this in another clue).
'vie'+'w'+'point'='VIEWPOINT'
(Other definitions for viewpoint that I've seen before include "Good outlook here" , "Way of thinking" , "Attitude that determines outlook" , "Stance" , "Opinion or position which is particularly good for admiring the scenery" .)