You won't care if you lose it (8)
I believe the answer is:
interest
'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" .)