Shilling haircut? (3)
I believe the answer is:
bob
I believe this clue is a double definition.
'shilling' is the first definition.
(thesaurus)
'haircut?' is the second definition.
(I've seen this before)
(Other definitions for bob that I've seen before include "Change" , "way locks can be arranged" , "Short haircut for an old shilling?" , "Briefly curtsey" , "short hair" .)