Di leaves North American in Promised Land (6)
I believe the answer is:
canaan
'promised land' is the definition.
(I've seen this before)
'di leaves north american' is the wordplay.
'leaves' suggests deleting specific letters.
'north american' becomes 'canadian' (Canadian is an example).
'canadian' with 'di' removed is 'CANAAN'.
'in' acts as a link.
(Other definitions for canaan that I've seen before include "Israelites' Promised Land" , "Old Palestine" , "Biblical Promised Land" , "ancient country" , "Ancient Palestine, the Promised Land" .)