Squad car sound (5)
I believe the answer is:
siren
'squad car sound' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for siren that I've seen before include "Device producing a loud wailing sound as a signal" , "Warning signal generator" , "Temptress - makes a loud noise!" , "Temptress - warning device" , "Warning device, alluring woman" .)