Darned two down's first (6)

I believe the answer is:

deuced

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'darned' is the definition.
('deuced' can be a synonym of 'darned')

'two down's first' is the wordplay.
'two' becomes 'deuce' ('deuce' can be a synonym of 'two').
'down's first' becomes 'd' (I can't justify this - if you can you should give a lot more credence to this answer).
'deuce'+'d'='DEUCED'

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I've seen this clue in The Telegraph.

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