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