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Unfasten (4)

Ross

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4

5 6 7

'unfasten' is the definition.
(I know that unfasten is a more specific form of the action the undo)

This is all the clue.

(Other definitions for undo that I've seen before include "Ruin or loosen ties" , "Cancel - destroy" , "Spoil" , "Unfasten or annul" , "Reverse effect of" .)

I've seen this clue in The Telegraph, The Times, The Star Tribune, the Sydney Morning Herald, The New York Times, The Mirror and the Evening Standard.
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