Crossword Genius

Entryphone (informal) (6)

Ross

I believe the answer is:

buzzer

(Other definitions for buzzer that I've seen before include "Signalling device (for a wasp, perhaps)" , "Game-show button" , "Bee - it's used on quiz shows" , "one might be pushed for an answer" , "Electric bell?" .)

I've seen this clue in The Guardian.
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