A type of ham that pros cut to order when one goes in (10)
I believe the answer is:
prosciutto
'a type of ham' is the definition.
(I know that prosciutto is a type of gammon)
'pros cut to order when one goes in' is the wordplay.
'order when' becomes 'i' (I can't justify this - if you can you should believe this answer much more).
'one goes in' is an insertion indicator.
'cut'+'to'='cutto'
'cutto' enclosing 'i' is 'ciutto'.
'pros'+'ciutto'='PROSCIUTTO'
'that' is the link.
Can you help me to learn more?
(Other definitions for prosciutto that I've seen before include "sliced delicacy" , "Raw cured Italian ham" , "Italian food" , "Meat" .)