Crossword Genius

Signal made by one's nose (6)

Ross

I believe the answer is:

hooter

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'nose' is the definition.
(hooter can informally mean someone's nose)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for hooter that I've seen before include "It makes a loud noise" , "Uphill stone pusher (Gk. myth)" , "alarm" , "One scents" , "Factory siren" .)

I've seen this clue in The Mirror.
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