Head, slangily (3)
I believe the answer is:
nob
'head slangily' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for nob that I've seen before include "Aristocrat" , "Person of wealth or high social position" , "A slangy person of high rank - c'est bon" , "Jack" , "A slang toff - c'est bon" .)