Huge portion of sauerbraten or moussaka (8)
I believe the answer is:
enormous
'huge' is the definition.
('enormous' can be a synonym of 'huge')
'portion of sauerbraten or moussaka' is the wordplay.
'portion of' says the answer is hidden in the clue.
'ENORMOUS' is hidden within 'sauerbraten or moussaka'.
(Other definitions for enormous that I've seen before include "Unusually large - jumbo" , "Huge, tremendous" , "Vast" , "Gross" , "Massive" .)