A dog lead (7)
I believe the answer is:
pointer
This clue is a double definition.
'a dog' is the first definition.
(pointer is a kind of dog)
'lead' is the second definition.
(thesaurus)
(Other definitions for pointer that I've seen before include "Game dog, used for its ability to scent" , "Gun dog" , "Hint (for a dog?)" , "Guide" , "Dog; cursor" .)