Spooner's wrong to cherish a boiled sweet (6)

I believe the answer is:

humbug

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'a boiled sweet' is the definition.
(I know that Humbug is a type of hard candy)

I can't explain the rest of the clue.

(Other definitions for humbug that I've seen before include "Baloney" , "Minty sweet" , "Noise of a bee with an insect makes a sham" , "Peppermint confection" , "Hypocrisy and cant - ask Scrooge" .)

I've seen this clue in The Guardian.

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