Crossword Genius

Almost nothing wasted but time (4,2)

Ross

I believe the answer is:

nigh on

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'almost' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for nigh on that I've seen is " Almost".)

I've seen this clue in the Sydney Morning Herald.
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