A bighead takes a French one, to eat (3)
I believe the answer is:
bun
'one to eat' is the definition.
I can't judge whether this definition defines the answer.
'a bighead takes a french' is the wordplay.
'a bighead' becomes 'b' (head letter of 'big').
'takes' is a charade indicator (letters next to each other).
'a french' becomes 'un' ('a' in French).
'b'+'un'='BUN'
Can you help me to learn more?
(Other definitions for bun that I've seen before include "Small rounded bread or cake" , "Small cake - tied-up hair" , "Small cake or bread roll" , "Something from Bath or Chelsea" , "Tied hair" .)