Disproved notes weren't honest (6)
I believe the answer is:
belied
'disproved' is the definition.
(thesaurus)
'notes weren't honest' is the wordplay.
I cannot really understand how this works, but
'notes' could be 'ed' and 'ed' is found in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for belied that I've seen before include "Failed to confirm, or gave false idea of" , "Contradicted or disproved" , "Contradicted, negated" .)