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Nullify (6)

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6

'nullify' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for undo that I've seen before include "Loosen; annul" , "Open, a knot say" , "Open buttons or ruin" , "set free" , "Unravel or ruin" .)

I've seen this clue in the King Feature Syndicate, The Mirror, The Sun, the Newsday, The Wall Street Journal and The Sunday Times.
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