Two forty for both (5)

I believe the answer is:

deuce

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'two' is the definition.
(synonyms)

I can't explain the remainder of the clue.

(Other definitions for deuce that I've seen before include "score, forty apiece" , "Devil" , "score at Wimbledon?" , "40 - 40 (tennis)" , "Dickens" .)

I've seen this clue in the Evening Standard.

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