Fruit supply in a tree (5)
I believe the answer is:
eater
'fruit supply' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'a tree' is the wordplay.
'a tree' anagrams to 'EATER'.
However, I'm not sure how this is indicated.
'in' is the link.
Can you help me to learn more?
(Other definitions for eater that I've seen before include "One consuming" , "Person taking course" , "Apple, perhaps" , "Taker of food" , "diner" .)