Italian ham (5)
'italian ham' is the definition.
(Parma ham)
This is the entire clue.
(Other definitions for parma that I've seen before include "Italian city known for ham and violets" , "Italian city famous for cheese and ham" , "European city" , "It. ham city; its Charterhouse, Stendhal" , "Source of ham and cheese" .)
(Other definitions for prosciutto that I've seen before include "Raw cured Italian ham" , "Italian food" , "sliced delicacy" , "Meat" .)