Hot Mexican pepper (8)
I believe the answer is:
jalapeno
'hot mexican pepper' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for jalapeno that I've seen before include "Green chilli pepper used in Mexican cooking" , "Hot type of capsicum pepper" , "Hot green chilli" , "Very hot chilli pepper" , "something really hot" .)