Features slip off (4)
I believe the answer is:
lips
'features' is the definition.
The definition and answer can be both body parts as well as being plural nouns.
Perhaps they are linked in a way I don't understand?
'slip off' is the wordplay.
'off' indicates anagramming the letters.
'slip' is an anagram of 'LIPS'.
Can you help me to learn more?
(Other definitions for lips that I've seen before include "Folds of tissue round the mouth" , "Rim of the mouth" , "Take, O take those - away (Measure for Measure)" , "Fleshy folds on the face" , "margins" .)