Crossword Genius

The hi-fi's 'noise gremlin'? Nonsense! (6)

Ross

I believe the answer is:

humbug

I'm a little stuck... Click here to teach me more about this clue!

'nonsense' is the definition.
(I know that humbug is a type of nonsense)

'the hi-fi's 'noise gremlin'?' is the wordplay.
I cannot really see how this works, but
''noise' could be 'hum' (hum is a kind of noise) and 'hum' is present in the answer.
The remaining letters 'bug' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for humbug that I've seen before include "Boiled sweet - rubbish" , "Con" , "Baloney" , "Hypocrite - bah!" , "Minty sweet" .)

I've seen this clue in the Evening Standard.
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