Crossword Genius

A paid informer in the private sector? (5)

Ross

I believe the answer is:

tutor

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

This might be a double definition.

'a paid informer' is the first definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'private sector?' is the second definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'in the' acts as a link.

Can you help me to learn more?

(Other definitions for tutor that I've seen before include "Guardian" , "trainer" , "Teach" , "Private instructor" , "Private educator" .)

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