Personal view, or estimation (7)
I believe the answer is:
opinion
This clue is a double definition.
'personal view' is the first definition.
(I've seen this before)
'estimation' is the second definition.
(I've seen this before)
(Other definitions for opinion that I've seen before include "View, judgement" , "Belief not founded on proof or certainty" , "thinking" , "View, barrister's advice" , "Belief or conviction" .)