Parry a sword (4)

I believe the answer is:

foil

I believe this is a double definition.

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

'a sword' is the second definition.
(foil is a kind of sword)

(Other definitions for foil that I've seen before include "Check" , "hamper" , "Frustrate with fencing sword" , "Hinder - prevent" , "Frustrate; kitchen wrap" .)

I've seen this clue in the Evening Standard.

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