Grow crop, last of rye bordering vital ground (9)
I believe the answer is:
Here is my best explanation:
'grow' is the definition.
'crop last of rye bordering vital ground' is the subsidiary indication.
'crop' becomes 'cut'.
'last of' suggests the final letters.
'bordering' is an insertion indicator.
'ground' indicates anagramming the letters (grind the letters ).
The last letter of 'rye' is 'e'.
'vital' anagrammed gives 'ltiva'.
'cute' going around 'ltiva' is 'cultivate'.
(Other definitions for cultivate that I've seen before include "Foster", "Promote", "Try to get in with" and "Grow (crops)".)