Your uncle’s hairstyle? (3)
I believe the answer is:
bob
This clue is a double definition.
'your uncle's' is the first definition.
(as in the phrase 'Bob's your uncle')
'hairstyle?' is the second definition.
(bob is a kind of hairstyle)
(Other definitions for bob that I've seen before include "Briefly curtsey" , "Brief curtsy - hairstyle" , "short hair" , "Briefly curtsy; hair style" , "money once" .)