Crossword Genius

To honour debts is questionable (7)

Ross

I believe the answer is:

dubious

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'questionable' is the definition.
(similar in meaning)

'to honour debts' is the wordplay.
'to honour' becomes 'dub' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'debts' becomes 'IOUs' (promises to pay debts).
'dub'+'ious'='DUBIOUS'

'is' is the link.

Can you help me to learn more?

(Other definitions for dubious that I've seen before include "Arousing suspicion" , "Doubtful, uncertain" , "untrustworthy" , "Sceptical, doubtful" , "Open to suspicion" .)

I've seen this clue in The Globe and Mail.
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