Cultivate area on right side of hill to provide food in Mexico (8)
I believe the answer is:
tortilla
'food in mexico' is the definition.
(tortillas are flatbreads eaten in Mexico)
'cultivate area on right side of hill' is the wordplay.
'cultivate' becomes 'till' (I've seen this in another clue).
'area' becomes 'a' (maths abbreviation).
'on right side of' is a charade indicator (letters next to each other) (some letters go to the right of others).
'hill' becomes 'tor' (tor is a kind of hill).
'till'+'a'='tilla'
'tilla' after 'tor' is 'TORTILLA'.
'to provide' acts as a link.
(Other definitions for tortilla that I've seen before include "Mexican dish" , "One; military grouping" , "Mexican filled pancake" , "Mexican corn-meal pancake" , "Mexican maize pancake" .)