Mexican food left in ruined hacienda (9)
I believe the answer is:
enchilada
'mexican food' is the definition.
(I've seen this before)
'left in ruined hacienda' is the wordplay.
'left' becomes 'L' (common abbreviation).
'in' indicates putting letters inside.
'ruined' indicates an anagram.
'hacienda' with letters rearranged gives 'enchiada'.
'l' going inside 'enchiada' is 'ENCHILADA'.
(Other definitions for enchilada that I've seen before include "Mexican food" , "Filled tortilla served with chilli sauce" , "Tortilla and chilli dish" , "Rolled stuffed tortilla with chilli sauce" , "Mexican dish" .)