Babe in film, one in Portuguese (3)
I believe the answer is:
pig
'babe in film' is the definition.
(Babe is a pig in the film Babe)
'one in portuguese' is the wordplay.
'one' becomes 'i' (Roman numeral).
'in' indicates putting letters inside.
'portuguese' becomes 'pg' (abbreviation for Portugal).
'i' inserted inside 'pg' is 'PIG'.
(Other definitions for pig that I've seen before include "& 16 Animal pen" , "Unforged metal" , "Glutton" , "Mass of metal simply cast" , "Greedy person (colloq.)" .)