Greek character and German swine (3)
I believe the answer is:
pig
'swine' is the definition.
(pig is a kind of swine)
'greek character and german' is the wordplay.
'greek character' becomes 'pi' (letter from the Greek alphabet).
'and' means one lot of letters go next to another.
'german' becomes 'g' (abbreviation).
'pi'+'g'='PIG'
(Other definitions for pig that I've seen before include "Unforged metal" , "Empress of Blandings?" , "One scoffs" , "Difficult task" , "Quantity of metal" .)