Mane (4)
I believe the answer is:
hair
'mane' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for hair that I've seen before include "It grows from the skin" , "Barber's speciality; musical" , "Threadlike strands growing from the skin" , "Penitent's shirt material" , "Growth from skin" .)