Plant that can sting bug (6)
I believe the answer is:
nettle
I believe this is a double definition.
'plant that can sting' is the first definition.
(as in stinging nettles)
'bug' is the second definition.
(I know that bug is a more specific form of the action bedevil)
(Other definitions for nettle that I've seen before include "To be annoying" , "Grasp it firmly and it will not sting" , "Plant with stinging hairs" , "Stinging weed - pester" , "Wild plant - annoy" .)