Crossword Genius

Frustrate, thwart (4)

Ross

I think it could be either:

Which length description are you looking for?:

4

6

I believe this is a double definition.

'frustrate' is the first definition.
(I know that frustrate can be written as foil)

'thwart' is the second definition.
(I know that thwart can be written as foil)

(Other definitions for foil that I've seen before include "Repulse" , "Frustrate - sheet - rapier" , "Frustrate with fencing sword" , "Thin metal - sword" , "Prevent from succeeding" .)

I've seen this clue in The Guardian.
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