Crossword Genius

You won't care if you lose it (8)

Ross

I believe the answer is:

interest

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

'lose it' is the definition.
The definition and answer can be both to do with human feelings as well as being verbs in their base form.
Perhaps there's a link between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for interest that I've seen before include "Sum paid on a loan" , "Curiosity or concern, or a financial stake in (8)" , "Return" , "Fixed charge for borrowing money" , "Gain - attention" .)

I've seen this clue in The Guardian, The Globe and Mail, The Irish News and The Telegraph.
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