New name for neck hair (4)
I believe the answer is:
mane
'neck hair' is the definition.
(I've seen this before)
'new name' is the wordplay.
'new' indicates anagramming the letters.
'name' with letters rearranged gives 'MANE'.
'for' acts as a link.
(Other definitions for mane that I've seen before include "Long shaggy hair" , "Hair (of lion)" , "Long flowing hair" , "Neck hair of an animal" , "Long thick hair" .)