Opening right inside tonsil repaired (7)
I believe the answer is:
nostril
'opening' is the definition.
(I know that nostril is a type of opening)
'right inside tonsil repaired' is the wordplay.
'right' becomes 'r' (common abbreviation).
'inside' indicates putting letters inside.
'repaired' is an anagram indicator.
'tonsil' is an anagram of 'nostil'.
'r' placed into 'nostil' is 'NOSTRIL'.
(Other definitions for nostril that I've seen before include "Nasal passage" , "Part of nose" , "Breathing channel" , "Opening of the nose" , "Nasal aperture" .)