Tortilla snack (5)
I believe the answer is:
nacho
'tortilla snack' 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 "Mexican bite" , "Mexican corn chip eaten with cheese, etc" , "Mexican dish" , "Piece of tortilla served with sauce" , "Tortilla with cheese, etc" .)