Revolutionary doctor has a right to cheese (7)
I believe the answer is:
cheddar
'cheese' is the definition.
(I know that Cheddar is a cheese)
'revolutionary doctor has a right' is the wordplay.
'revolutionary' becomes 'Che' (Che Guevara).
'doctor' becomes 'DD' (Doctor of Divinity).
'has' is a charade indicator (letters next to each other).
'a right' becomes 'ar' (I've seen this in other clues).
'che'+'dd'+'ar'='CHEDDAR'
'to' is the link.
(Other definitions for cheddar that I've seen before include "Popular cheese originally from Somerset" , "Kind of cheese" , "English cheese variety" , "Hard 8 across" , "Somerset gorge location" .)