One of The Wailers on the road with The Police (5)
I believe the answer is:
siren
'one of' is the definition.
The definition suggests a singular noun which matches the answer.
'wailers on the road with the police' is the wordplay.
I cannot really understand how this works, but
'on' could be 're' (regarding) and 're' is found within the answer.
The remaining letters 'sin' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'the' acts as a link.
Can you help me to learn more?
(Other definitions for siren that I've seen before include "Bewitching singer" , "Hooter - dangerous woman?" , "Bewitching singer,part- woman, part-bird" , "Risen like Lorelei" , "Loud warning signal" .)