Rin Tin Tin, for one (6)
I believe the answer is:
canine
'rin tin tin for one' is the definition.
(I know that Rin Tin Tin is a dog)
This is the entire clue.
(Other definitions for canine that I've seen before include "Fang" , "like a setter" , "Boxer" , "Tooth; dog" , "such as Lassie" .)