I noticed Ron splashing around bathroom product (11)
I believe the answer is:
conditioner
'bathroom product' is the definition.
'i noticed ron splashing around' is the wordplay.
'splashing around' indicates an anagram.
'i'+'noticed'+'ron'='inoticedron'
'inoticedron' with letters rearranged gives 'CONDITIONER'.
(Other definitions for conditioner that I've seen before include "Hair application" , "Hair improver" , "Shock treatment" .)