Clarified butter Frenchman maybe picked up (4)
I believe the answer is:
ghee
'clarified butter' is the definition.
(ghee is a kind of clarified butter)
'frenchman maybe picked up' is the wordplay.
'frenchman maybe' becomes 'Guy' (Guy is a common French name).
'picked up' shows a homophone (sound like).
'guy' is a homophone of 'GHEE'.
(Other definitions for ghee that I've seen before include "Clarified butter used in Indian cookery" , "clarified product" , "Clarified butter sauce" , "type of butter" , "Use it to cook" .)