Sheepdog (6)
I believe the answer is:
collie
'sheepdog' is the definition.
(I know that Collie is a type of sheepdog)
This is the entire clue.
(Other definitions for collie that I've seen before include "Sheepdog with long pointed muzzle" , "Popular sheepdog like Lassie" , "Silky-coated sheepdog" , "Sheepdog wth ling nose and shaggy hair" , "Type of sheepdog" .)