Klaxon (6)

I think it could be either:

Which length description are you looking for?:

hooter

'klaxon' is the definition.
(thesaurus)

This is the entire clue.

(Other definitions for hooter that I've seen before include "Siren, steam whistle" , "Uphill stone pusher (Gk. myth)" , "Car horn or slang nose" , "It makes a loud noise" , "Siren, horn; nose" .)

I've seen this clue in The Irish Independent, the Evening Standard and The Mirror.

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