Chihuahua chow (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">chihuahua chow</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for taco that I've seen before include "Mexican filled pancake" , "Folded and filled tortilla" , "Coat with Mexican dish" , "Filled tortilla roll" , "Tortilla rolled round a filling" .)