Crossword Genius

... unnecessarily, as Countdown is finally going (3)

Ross

I believe the answer is:

too

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

'unnecessarily' is the definition.
Both the definition and answer are adverbs. Perhaps there's a link between them I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for too that I've seen before include "Additionally" , "On top - also" , "As well, also" , "What a pity!" , "To a greater than desirable extent" .)

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