Crossword Genius

Nothing to fasten? That's what you think! (7)

Ross

I believe the answer is:

opinion

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'that's what you think' is the definition.
(I've seen this in another clue)

'nothing to fasten?' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'to fasten?' becomes 'pinion' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'o'+'pinion'='OPINION'

Can you help me to learn more?

(Other definitions for opinion that I've seen before include "Estimation" , "Conviction - point of view" , "View, barrister's advice" , "Personal belief or judgment" , "Assessment" .)

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