Mexican food from upcoming Acapulco caterer (4)
I believe the answer is:
taco
'mexican food' is the definition.
(type of Mexican snack)
'from upcoming acapulco caterer' is the wordplay.
'upcoming' says the letters should be written backwards (in a down clue coming up is backwards).
'from' says the answer is hidden in the clue.
'ocat' is hidden in the letters of 'acapulco caterer'.
'ocat' backwards is 'TACO'.
(Other definitions for taco that I've seen before include "foreign food" , "Mexican rolled pancake with a filling" , "Coat with Mexican dish" , "Tortilla rolled round a filling" , "Folded and filled tortilla" .)