(Mexican) chip (5)
I believe the answer is:
nacho
'mexican chip' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for nacho that I've seen before include "Small piece of tortilla with a topping" , "kind of chip" , "Tortilla chip topped with cheese and spices" , "Piece of tortilla served with sauce" , "Tortilla crisp" .)