Sudan ends rebuilding of these desert features (4-5)
I believe the answer is:
sand-dunes
'these desert features' is the definition.
(I've seen this in another clue)
'sudan ends rebuilding' is the wordplay.
'rebuilding' indicates anagramming the letters.
'sudan'+'ends'='sudanends'
'sudanends' anagrammed gives 'SAND-DUNES'.
'of' is the link.
(Other definitions for sand-dunes that I've seen before include "Coastal mounds" , "Ridges created by the wind near the sea" .)