Unexpectedly hid a clean dish (9)
I believe the answer is:
enchilada
'dish' is the definition.
(I know that enchilada is a type of dish)
'unexpectedly hid a clean' is the wordplay.
'unexpectedly' indicates anagramming the letters.
'hid'+'a'+'clean'='hidaclean'
'hidaclean' is an anagram of 'ENCHILADA'.
(Other definitions for enchilada that I've seen before include "Filled tortilla served with chilli sauce" , "Hot food" , "spicy food" , "Tortilla and sauce, meat" , "hot dish" .)