Mexican entree (4)
I believe the answer is:
taco
'mexican entree' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for taco that I've seen before include "Mexican snack" , "Tortilla with savoury filling" , "Set of three" , "Tortilla rolled round a filling" , "Mexican rolled pancake with a filling" .)