1960s musical (4)
I believe the answer is:
hair
'1960s musical' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hair that I've seen before include "Outgrowth from the skin" , "It grows from a follicle" , "shock" , "The American Tribal Love-Rock Musical (1967)" , "Fur - mop" .)