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 am not certain of 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" .)