Crossword Genius

Needs one twice as new, not dated (7)

Ross

I believe the answer is:

sinedie

I'm a little stuck... Click here to teach me more about this clue!

'needs one twice' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'as new not dated' is the wordplay.
I cannot really see how this works, but
'as' could be 'in' (I've seen this in other clues) and 'in' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Times.
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