Crossword Genius

Commonly quit humbug (4)

Ross

I believe the answer is:

bunk

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'humbug' is the definition.
(thesaurus)

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

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(Other definitions for bunk that I've seen before include "Type of bed" , "A tiered bed" , "Rubbish - place to sleep" , "Somewhere to sleep" , "History (said Henry Ford) - bed!" .)

I've seen this clue in The Telegraph.
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