Cultivating endless fruit (6)
I believe the answer is:
raisin
'cultivating' is the definition.
(I've seen this before)
'endless fruit' is the wordplay.
'endless' means to remove the last letter.
'fruit' becomes 'raisins' (I've seen this before).
'raisins' with its final letter removed is 'RAISIN'.
(Other definitions for raisin that I've seen before include "A dried grape, nice in cake" , "Fruit for the Christmas cake" , "Dried fruit" , "Dried grape used in cakes" , "sultana, say" .)