Nuisance, bane (4)
I believe the answer is:
pest
This clue is a double definition.
'nuisance' is the first definition.
(I've seen this before)
'bane' is the second definition.
(I've seen this in another clue)
(Other definitions for pest that I've seen before include "Troublesome person" , "Menace" , "Annoying person" , "Constant nuisance" , "Annoyance" .)