Notes wicked plague (7)

I believe the answer is:

bedevil

I'm a little stuck... Click here to teach me more about this clue!

'plague' is the definition.
(thesaurus)

'notes wicked' is the wordplay.
'notes' becomes 'be'.
'wicked' becomes 'devil' (I can't justify this - if you can you should give a lot more credence to this answer).
'be'+'devil'='BEDEVIL'

Can you help me to learn more?

(Other definitions for bedevil that I've seen before include "Bug" , "Afflict" , "Torture" , "trouble" , "Vile bed (anag.)" .)

I've seen this clue in The Mirror.

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