Sauce a part of canapés today? (5)
I believe the answer is:
pesto
'sauce' is the definition.
(pesto is a type of sauce)
'a part of canapes today?' is the wordplay.
'a part of' indicates a hidden word.
'PESTO' is hidden in the letters of 'canapes today'.
(Other definitions for pesto that I've seen before include "Italian sauce containing basil" , "sauce involving Basil" , "Sauce made of basil and cheese" , "Saucy work" , "Sauce of basil, pine nuts, etc" .)