Bishop gets a French cake (3)
I believe the answer is:
bun
'cake' is the definition.
(bun is a type of cake)
'bishop gets a french' is the wordplay.
'bishop' becomes 'B' (chess abbreviation).
'gets' says to put letters next to each other.
'a french' becomes 'un' ('a' in French).
'b'+'un'='BUN'
(Other definitions for bun that I've seen before include "Something from Bath or Chelsea" , "Hairstyle, cake" , "Small rounded bread or cake" , "Kind of small round cake" , "A small cake, sweet and round" .)