Plague, afflict (7)
I believe the answer is:
bedevil
I believe this is a double definition.
'plague' is the first definition.
(I've seen this in another clue)
'afflict' is the second definition.
(I've seen this before)
(Other definitions for bedevil that I've seen before include "Vile bed (anag.)" , "Cause difficulties for, like Satan?" , "Torture" , "Dog" , "Worry, harass" .)