Hair product (5)
'hair product' is the definition.
(hair gel)
This is all the clue.
(Other definitions for gel that I've seen before include "well-spoken deb?" , "Upstage" , "Viscid substance" , "Hair treatment" , "Leg it back to get some for your hair" .)
(Other definitions for shampoo that I've seen before include "Hair-cleansing agent" , "Top cleaning product" , "Soapy liquid for hair" , "Hair-cleaner" , "Cleaner for locks" .)
(Other definitions for rinse that I've seen before include "Hair tint" , "Wash in clean water" , "Mouth cleansing solution" , "Use water to remove soap" , "Wash - siren (anag)" .)