Canine gripped by condescending orthodontist (5)
I believe the answer is:
dingo
'canine' is the definition.
(dingo is a kind of canine)
'gripped by condescending orthodontist' is the wordplay.
'gripped by' says the answer is hidden in the clue.
'DINGO' is hidden within 'condescending orthodontist'.
(Other definitions for dingo that I've seen before include "Australian native" , "Kipling's yellow dog" , "Wild thing" , "Want a dog" , "Scavenger" .)