Crossword Genius

One responsible for producing humbug among others? (12)

Ross

I believe the answer is:

conventional

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'one responsible' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for conventional that I've seen before include "Standard" , "Customary; not 9 ac" , "Customary, mainstream" .)

I've seen this clue in The Telegraph.
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