Soup: food served with ginger, sent back (7)
I believe the answer is:
chowder
'soup' is the definition.
(chowder is a kind of soup)
'food served with ginger sent back' is the wordplay.
'food' becomes 'chow' (chow is a kind of food).
'served with' means one lot of letters go next to another.
'ginger' becomes 'red' (red ginger is a kind of ginger).
'sent back' is a reversal indicator.
'red' written backwards gives 'der'.
'chow'+'der'='CHOWDER'
(Other definitions for chowder that I've seen before include "Thick seafood soup" , "Clam stew, soup" , "Fish soup for cowherd" , "possible first course?" , "Thick soup containing clams or fish" .)