Crossword Genius

Thus having easily passed acid test, getting buzz (5)

Ross

I believe the answer is:

phone

'buzz' is the definition.
(I know that buzz can be written as phone)

I don't understand the remainder of the clue.

(Other definitions for phone that I've seen before include "Covert monitoring of electronic exchanges" , "Short piece of electronic equipment" , "Communications device" , "Receiver" , "Call (someone)" .)

I've seen this clue in The Times.
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