Salon goo (3)
I believe the answer is:
gel
'salon goo' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for gel that I've seen before include "Leg it back to get some for your hair" , "Preparation used in setting hair" , "Leg (anag.)" , "Posh female" , "Become jelly-like" .)