Bangs on the head? (4)
I believe the answer is:
hair
'bangs on the head?' 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 "Whisker" , "shock" , "Barber's speciality; musical" , "Threadlike strands growing from the skin" , "Musical with nude scenes" .)