Fine sprayer distributing blue rinse (9)
I believe the answer is:
nebuliser
'fine sprayer' is the definition.
(a nebuliser sprays liquid)
'distributing blue rinse' is the wordplay.
'distributing' indicates anagramming the letters.
'blue'+'rinse'='bluerinse'
'bluerinse' is an anagram of 'NEBULISER'.
(Other definitions for nebuliser that I've seen before include "dispensed by this" , "Device for producing a fine spray, for inhaling a medicinal drug, say" , "Drug delivery system" , "Spray - blue rinse (anag)" , "Used to inhale the drug" .)