Crossword Genius

Counter sword (4)

Ross

I believe the answer is:

foil

I believe this clue is a double definition.

'counter' is the first definition.
(thesaurus)

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

(Other definitions for foil that I've seen before include "Parry" , "thin plate of metal" , "Tharwt with Sword" , "Frustrate; kitchen wrap" , "Repulse" .)

I've seen this clue in The Telegraph.
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