A tropical oil and milk producer (7)
I believe the answer is:
coconut
This clue could be a double definition.
'a tropical oil' is the first definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'milk producer' is the second definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'and' acts as a link.
Can you help me to learn more?
(Other definitions for coconut that I've seen before include "Seed of a tropical palm" , "source of oil" , "Shy thing?" , "Hard-shelled fruit of palm tree with white lining" , "Large hard seed" .)