Everybody has an excellent right to it
I believe the answer is:
air
'everybody' is the definition.
I can't judge whether this definition defines the answer.
'an excellent right to it' is the wordplay.
'an excellent' becomes 'ai' (resembles 'A1', old-fashioned term for excellent).
'right' becomes 'r' (common abbreviation).
'to it' is a charade indicator (letters next to each other).
'ai'+'r'='AIR'
'has' is the link.
Can you help me to learn more?
(Other definitions for air that I've seen before include "Mixture of gases, especially oxygen" , "Divulge" , "'Tune, melody (3)'" , "- brick; - bed; - brush" , "Mixture of gases needed for breathing" .)