In dissent I'm entitled to opinion (9)
I believe the answer is:
sentiment
'opinion' is the definition.
('sentiment' can be a synonym of 'opinion')
'in dissent i'm entitled' is the wordplay.
'in' indicates the answer is hidden within the clue.
'SENTIMENT' is hidden within 'dissent im entitled'.
'to' acts as a link.
(Other definitions for sentiment that I've seen before include "Mawkishness" , "Tender or romantic emotion" , "Emotional feeling" , "View, opinion, feeling" , "Test men in, say, emotion" .)