Crossword Genius

It's kept on being secret where figures are concerned (3)

Ross

I believe the answer is:

lid

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

'where figures are concerned' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for lid that I've seen before include "Removable cover of a container" , "Cover from gliders" , "Hinged or removable cover as for bottle" , "Cover for box or eye" , "Kind of cover, may be hinged" .)

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