Crossword Genius

Knowing number has come up, moment appearing endless (7)

Ross

I believe the answer is:

gnostic

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'knowing' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for gnostic that I've seen before include "Relating to mystical knowledge" , "Occult" , "Having special mystical knowledge, costing a lot" .)

I've seen this clue in The Telegraph.
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