There's nothing to restrict the view (7)
I believe the answer is:
opinion
'the view' is the definition.
('opinion' can be a synonym of 'view')
'there's nothing to restrict' is the wordplay.
'there's nothing' becomes 'o' (I've seen this in other clues).
'to restrict' becomes 'pinion' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'o'+'pinion'='OPINION'
Can you help me to learn more?
(Other definitions for opinion that I've seen before include "Unproved belief or view" , "Personal belief or judgment" , "Viewpoint" , "Standpoint" , "A view held, what one thinks" .)