Mashed avocado dish (9)
I believe the answer is:
guacamole
'mashed avocado dish' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for guacamole that I've seen before include "tasty dip" , "Avocado-based dish" , "Mashed avocado dish" , "Mexican dish" , "Avocado dip" .)