A tsetse fly lands! (7)
I believe the answer is:
estates
'lands' is the definition.
('estate' can be a synonym of 'land')
'a tsetse fly' is the wordplay.
'fly' indicates an anagram.
'a'+'tsetse'='atsetse'
'atsetse' with letters rearranged gives 'ESTATES'.
(Other definitions for estates that I've seen before include "lands for development" , "People leave them" , "Property?" , "The dead leave them" , "Country properties" .)