Money, reward for something tropical (10)
I believe the answer is:
breadfruit
'something tropical' is the definition.
I can't judge whether this defines the answer.
'money reward' is the wordplay.
'money' becomes 'bread' (bread is slang for money).
'reward' becomes 'fruit' (I have seen 'Reward of activity ' mean 'fruit' so perhaps 'reward' could also mean 'fruit').
'bread'+'fruit'='BREADFRUIT'
'for' is the link.
Can you help me to learn more?
(Other definitions for breadfruit that I've seen before include "Highly nutritious product of tropical tree" , "evergreen tree provided" , "Pacific crop" , "South Sea island diet" .)