Not exactly a heavenly sound (4,2,1,5)

I believe the answer is:

hell of a noise

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'not exactly a heavenly' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'sound' is the wordplay.
I cannot quite understand how this works, but
'sound' could be 'noise' (noising is a kind of sounding) and 'noise' is present in the answer.
This explanation may well be incorrect...

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I've seen this clue in The Globe and Mail.

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