Leaves wastelands (7)
I believe the answer is:
deserts
I believe this clue is a double definition.
'leaves' is the first definition.
(to desert someone is to leave them)
'wastelands' is the second definition.
(I've seen this in another clue)
(Other definitions for deserts that I've seen before include "Kalahari and Gobi" , "Maroons, abandons" , "Abandons - just reward" , "They may be just" , "Abandons; barren places" .)