Harass a hunting dog (5)
I believe the answer is:
hound
I believe this is a double definition.
'harass' is the first definition.
(I've seen this in another clue)
'a hunting dog' is the second definition.
(I know that hound is a type of hunting dog)
(Other definitions for hound that I've seen before include "Chase after" , "Persecute; dog" , "despicable person" , "Pursue (like a dog?)" , "Give no peace" .)