Snake's sound (4)

I think it could be either:

Which length description are you looking for?:

hiss

'snake's sound' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for hiss that I've seen before include "Audio interference" , "Sharp sound of disapproval" , "Sound of serpent" , "Urgently whisper" , "Sound of escaping gas" .)

I've seen this clue in the USA Today, The New York Times, The Telegraph, The Sun, The Star Tribune, The Mirror and the Newsday.

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