Crossword Genius

Sweet sound of buzzing insect (6)

Ross

I believe the answer is:

humbug

'sweet' is the definition.
(boiled sweet)

'sound of buzzing insect' is the wordplay.
'sound of buzzing' becomes 'hum' (a humming sound).
'insect' becomes 'bug' (bug is a kind of insect).
'hum'+'bug'='HUMBUG'

(Other definitions for humbug that I've seen before include "Pretentious talk or boiled sweet" , "Hypocrisy - bah!" , "False or hypocritical talk" , "that a sucker may enjoy" , "Hypocrisy and cant - ask Scrooge" .)

I've seen this clue in The Telegraph.
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