Crossword Genius

___ Leonean (6)

Ross

I believe the answer is:

sierra

(Other definitions for sierra that I've seen before include "Jagged mountains - code word for S" , "Mountain range in Spanish-speaking countries" , "Comms code S" , "------ Nevada, mountains of Spain and California" , "Long jagged mountain chain" .)

I've seen this clue in the USA Today.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.