Walrus feature (4)
I believe the answer is:
tusk
'walrus feature' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tusk that I've seen before include "Elephant's dentine" , "Protruding ivory, of elephant say" , "Jumbo tooth" , "What's the point of a Jumbo that's hard" , "Ivory-coloured dentine" .)