Guacamole base (7)
I believe the answer is:
avocado
'guacamole base' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for avocado that I've seen before include "one's stoned?" , "Ingredient of guacamole" , "Greenish-colour" , "Savoury pear" , "Dark green fruit like posh pear" .)