Ham producer's Japanese production around area (4)
I believe the answer is:
noah
'ham producer's' is the definition.
(father of Ham in the Bible)
'japanese production around area' is the wordplay.
'japanese production' becomes 'noh' (I am not sure about this - if you are sure you should believe this answer much more).
'around' indicates putting letters inside.
'area' becomes 'a' (maths abbreviation).
'noh' enclosing 'a' is 'NOAH'.
Can you help me to learn more?
(Other definitions for noah that I've seen before include "Biblical shipbuilder" , "The first Arkwright!" , "First collector of animals?" , "Sailor who ran aground on Mount Ararat" , "Patriarch who saved his family and all the animals from drowning" .)