Cute siren went off for very long time (9)
I believe the answer is:
centuries
'for very long time' is the definition.
I can't judge whether this defines the answer.
'cute siren went' is the wordplay.
'went' indicates an anagram ('go' can mean move).
'cute'+'siren'='cutesiren'
'cutesiren' with letters rearranged gives 'CENTURIES'.
'off' acts as a link.
Can you help me to learn more?
(Other definitions for centuries that I've seen before include "Censure it for hundreds of years" , "Periods of 100 years" .)