Talk by egghead with gold from French castle (7)
I believe the answer is:
chateau
'french castle' is the definition.
('castle' in French)
'talk by egghead with gold' is the wordplay.
'talk' becomes 'chat' (chat can mean to talk).
'by' says to put letters next to each other.
'egghead' becomes 'e' (head letter of 'egg').
'with' means one lot of letters go next to another.
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'chat'+'e'+'au'='CHATEAU'
'from' is the link.
(Other definitions for chateau that I've seen before include "French county house" , "Impressive house in France" , "eg Margaux" , "French country home" , "Castle, especially in France" .)