An excellent right to give an opinion (3)
I believe the answer is:
air
'give an opinion' is the definition.
'air' can be an answer for 'give' (thesaurus). I'm not sure about the 'an opinion' bit.
'an excellent right' is the wordplay.
'an excellent' becomes 'ai' (resembles 'A1', old-fashioned term for excellent).
'right' becomes 'r' (common abbreviation).
'ai'+'r'='AIR'
'to' is the link.
Can you help me to learn more?
(Other definitions for air that I've seen before include "Simple tune" , "Publish" , "Expose" , "Element; tune" , "Mix of gases surrounding the earth" .)