Crossword Genius

Nobody else will know if we keep it (6)

Ross

I believe the answer is:

secret

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

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

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(Other definitions for secret that I've seen before include "One not to be divulged" , "Unidentified" , "Not generally known" , "Private, covert" , "Not seen or know by others" .)

I've seen this clue in The Globe and Mail.
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