The head, informally (5)
I believe the answer is:
bonce
'the head' is the definition.
(informal term for a person's head)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for bonce that I've seen before include "loaf" , "Noddle (slang)" , "Head (slang)" , "Head - noodle" , "Nana" .)