Rudolph's red feature (4)
I believe the answer is:
nose
'rudolph's red feature' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for nose that I've seen before include "Facial organ" , "Cyrano's large feature" , "Faculty for detecting" , "Sense of smell; proceed cautiously" , "Proboscis" .)