Remove soap from fake siren (5)
I believe the answer is:
rinse
'remove soap' is the definition.
(I've seen this before)
'fake siren' is the wordplay.
'fake' indicates anagramming the letters (I've seen this in other clues).
'siren' is an anagram of 'RINSE'.
'from' is the link.
(Other definitions for rinse that I've seen before include "Hair colourant" , "Hair tint" , "Swill out" , "blue one on top?" , "Mouth cleansing solution" .)