Some Mexican aperitifs and a bite to eat? (6)
I believe the answer is:
canape
'a bite to eat?' is the definition.
(a canape is a type of snack)
'some mexican aperitifs and' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'CANAPE' is hidden in the letters of 'mexican aperitifs and'.
(Other definitions for canape that I've seen before include "Savoury appetiser, often accompanied by Champagne" , "cocktail treat" , "Savoury nibble offered at posh parties" , "Cocktail delicacy" , "Hors d'oeuvre" .)