Baffles, frustrates (5)

I believe the answer is:

foils

This clue is a double definition.

'baffles' is the first definition.
('foil' can be a synonym of 'baffle')

'frustrates' is the second definition.
('foil' can be a synonym of 'frustrate')

(Another definition for foils that I've seen is " Thwarts with kinds of swords".)

I've seen this clue in the Evening Standard.

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