Plot wicked torment (7)
I believe the answer is:
bedevil
'torment' is the definition.
(I know that torment can be written as bedevil)
'plot wicked' is the wordplay.
'plot' becomes 'bed' (a plot of land).
'wicked' becomes 'evil' (synonyms).
'bed'+'evil'='BEDEVIL'
(Other definitions for bedevil that I've seen before include "Cause problems for" , "Torture" , "Cause difficulties for, like Satan?" , "Vile bed (anag.)" , "Throw into confusion" .)