A sound way to call the doctor (5)

I believe the answer is:

bleep

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'a sound' is the definition.
(bleep is a kind of sound)

I don't understand how the remainder of the clue works.

(Other definitions for bleep that I've seen before include "Make short shrill signalling sound" , "High pitched signal" , "Electronic noise signal" , "covers swearing" , "Noise of alarm" .)

I've seen this clue in the Evening Standard.

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