Shaving goop (3)
I believe the answer is:
gel
'shaving goop' 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 "Preparation used in setting hair" , "Congeal - hair dressing" , "Come together, take shape (colloq.)" , "Become jelly-like" , "stiffen" .)