Wheat ____ (4)
(Other definitions for germ that I've seen before include "Cause of infection" , "Start of an idea" , "Beginning (of an idea?)" , "Rudiment" , "Cause of illness" .)
'wheat' is the definition.
(durum is a kind of wheat)
This is all the clue.
(Other definitions for durum that I've seen before include "Wheat variety" , "Kind of wheat used to make pasta" , "Kind of hard wheat" , "Hard type of wheat" , "It makes pasta" .)