Mexican cloak (6)
I believe the answer is:
poncho
'mexican cloak' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for poncho that I've seen before include "Overgarment with hole for head" , "South American garment" , "Simple garment" , "Blanket-like cloth with centre slit, worn as cloak" , "Latin American cloak" .)