Throw up most of hard seafood (7)
I believe the answer is:
lobster
'seafood' is the definition.
(I know that lobster is a type of seafood)
'throw up most of hard' is the wordplay.
'throw up' becomes 'lob' (I've seen this before).
'most of' means to remove the last letter.
'hard' becomes 'stern' (I've seen this in another clue).
'stern' with its last letter taken off is 'ster'.
'lob'+'ster'='LOBSTER'
(Other definitions for lobster that I've seen before include "food?" , "It turns bright-red when cooked" , "Large edible crustacean" , "Marine creature" , "one to loft a > shellfish?" .)