Crossword Genius

Label certain notes “of uncertain authenticity” (7)

Ross

I believe the answer is:

dubious

'of uncertain authenticity' is the definition.
(dubious means uncertain or suspicious)

'label certain notes' is the wordplay.
'label' becomes 'dub' (both can mean to give a name).
'certain notes' becomes 'IOUs' ('I owe you' notes).
'dub'+'ious'='DUBIOUS'

(Other definitions for dubious that I've seen before include "Doubtful, uncertain" , "Open to suspicion" , "Uncertain - suspect" , "Of questionable value" , "Unsure, unconvinced" .)

I've seen this clue in The Times.
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