Camel's back feature (4)
I believe the answer is:
hump
'camel's back feature' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hump that I've seen before include "Protuberance; (the) sulks" , "A dromedary has one" , "Rounded protuberance" , "sleeping policeman" , "Part of a camel" .)