A lass stirred sauce (5)
I believe the answer is:
salsa
'sauce' is the definition.
(I know that salsa is a sauce)
'a lass stirred' is the wordplay.
'stirred' indicates an anagram.
'a'+'lass'='alass'
'alass' is an anagram of 'SALSA'.
(Other definitions for salsa that I've seen before include "Latin American dance music" , "that's hot and saucy?" , "Sauce; Afro-Cuban dance" , "Cuban dance music or spicy sauce" , "Latin-American dance" .)