Crossword Genius

Find stern tests all exposed curiosity (8)

Ross

I believe the answer is:

interest

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'curiosity' is the definition.
(interest is a kind of curiosity)

I don't understand the remainder of the clue.

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(Other definitions for interest that I've seen before include "Gain - attention" , "Gain - curiosity" , "Condition of curiosity about amount paid for use of money" , "earnings" , "Hobby" .)

I've seen this clue in The Telegraph.
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