Fruit of gold hill in east (9)
I believe the answer is:
aubergine
'fruit' is the definition.
(I've seen this before)
'gold hill in east' is the wordplay.
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'hill' becomes 'berg' (I can't explain this - if you can you should believe this answer much more).
'east' becomes 'e' (synonyms).
'au'+'berg'+'in'+'e'='AUBERGINE'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for aubergine that I've seen before include "I argue, Ben, that it's a fruit" , "Purple vegetable" , "Fruit of the eggplant" , "Vegetarians might order this" , "I agree bun could become a strange vegetable" .)