Nile feature (5)
I believe the answer is:
delta
'nile feature' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for delta that I've seen before include "Divided river outlet" , "Nile river mouth" , "Dealt (anag.)" , "Fragmented estuary" , "Roughly triangular area of alluvial deposits" .)