Cancel a French party (4)

I believe the answer is:

undo

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

'a french party' is the wordplay.
'a french' becomes 'un' ('a' in French).
'party' becomes 'do' (do is a kind of party).
'un'+'do'='UNDO'

(Other definitions for undo that I've seen before include "Open, a knot say" , "Cancel -- annul -- reverse" , "Loosen; annul" , "Unfasten or annul" , "Ruin, destroy" .)

I've seen this clue in The Independent and The Everyman puzzle in The Observer.

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