Felt or straw hat with a wide brim worn by men in Mexico (8)
I believe the answer is:
sombrero
(Other definitions for sombrero that I've seen before include "Straw hat with very wide brim from Mexico" , "Rob Morse of his strange hat" , "Broad-brimmed Mexican hat" , "Wide-brimmed hat of Mexico" , "Wide-brimmed 23" .)