Trade, one might be asked to mind one's own (8)
I believe the answer is:
business
'trade' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for business that I've seen before include "Occupation; concern" , "Baby" , "Commerce, trace" , "Affair - matters to be attended to" , "complicated problem" .)