Whets the appetite for investments (9)
I believe the answer is:
interests
'investments' is the definition.
The answer and definition can be both acts as well as being plural nouns.
Perhaps there's an association between them I don't understand?
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for interests that I've seen before include "Hobbies or preoccupations" , "Involvements, pastimes" , "Pursuits of triteness" , "Advantages" , "Appeals, fascinates" .)