Apple ___ (3)
(Another definition for inc that I've seen is " Including (abbrev.)".)
'apple' is the definition.
(Granny Smith is an example)
This is all the clue.
(Other definitions for granny smith that I've seen before include "Eating apple" , "Fruit" , "Type of apple" , "Hard, green-skinned apple" , "Mrs Anything (anag) - it's green and edible" .)