Profit from hobby (8)
I believe the answer is:
interest
This clue is a double definition.
'profit' is the first definition.
(thesaurus)
'hobby' is the second definition.
(thesaurus)
'from' acts as a link.
(Other definitions for interest that I've seen before include "Share in an undertaking" , "Hobby" , "Deep concern - premium paid for use of money" , "Money paid by borrower" , "Sense of concern or curiosity" .)