Eccentric siren taking a wash (5)
I believe the answer is:
rinse
'a wash' is the definition.
(rinse is a kind of wash)
'eccentric siren' is the wordplay.
'eccentric' indicates anagramming the letters.
'siren' is an anagram of 'RINSE'.
'taking' is the link.
(Other definitions for rinse that I've seen before include "Wash in clean water" , "Cleanse in water" , "Flush" , "blue one on top?" , "Use water to remove soap" .)