Nose set off siren (6)

I believe the answer is:

hooter

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This could be a double definition.

'nose set' is the first definition.
'hooter' can be an answer for 'nose' (hooter can informally mean someone's nose). I'm unsure of the 'set' bit.

'siren' is the second definition.
(hooter can mean a siren or alarm)

'off' is the link.

Can you help me to learn more?

(Other definitions for hooter that I've seen before include "alarm" , "owl?" , "Siren, horn; nose" , "Warning sound" , "Siren; nose (sl.)" .)

I've seen this clue in The Mirror.

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