Raised bishop to cardinal (4)
I believe the answer is:
bred
'raised' is the definition.
(I've seen this before)
'bishop to cardinal' is the wordplay.
'bishop' becomes 'b' (abbreviation used in chess).
'to cardinal' becomes 'red' (I've seen this in other clues**).
'b'+'red'='BRED'
(Other definitions for bred that I've seen before include "Multiplied" , "did produce issue" , "Nurtured" , "Engendered" , "Brought forth" .)