Ambulance sounds (6)
I believe the answer is:
sirens
'ambulance sounds' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sirens that I've seen before include "Loud wailing warnings sounds" , "Sea nymphs" , "Alluring women" , "Warning devices with loud wailing noise" , "Alarm whistles or temptresses of sailors" .)