The most common and most likely answer to this crossword clue is the 8 letter word BURRITOS
I've seen this crossword clue in The Guardian
B
U
R
R
I
T
O
S
More clues leading to the result BURRITOS
Buddy explains!

The straight part
We know that "Mexican food" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mexican food = burritos.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does BURRITOS mean?
BURRITOS noun- A Mexican dish consisting of a flour tortilla wrapped around a filling of meat and/or beans, cheese etc.
- Third-person singular simple present indicative form of burrito