Sauce eaten by colossal savage (5)
I believe the answer is:
salsa
'sauce' is the definition.
(I've seen this before)
'eaten by colossal savage' is the wordplay.
'eaten by' indicates the answer is hidden within the clue.
'SALSA' is hidden within 'colossal savage'.
(Other definitions for salsa that I've seen before include "Dance or a dip?" , "Sauce; Afro-Cuban dance" , "Latin American dance - spicy Mexican sauce" , "Chilli sauce" , "Latin American dance music" .)