Hound: animal pursuing deer no end (6)
I believe the answer is:
harass
'hound' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for harass that I've seen before include "Badger, antagonise" , "Pester, annoy continually (6)" , "Make repeated attacks on" , "Constantly intimidate" , "Annoy persistently, persecute" .)