Noisy outburst of four voices (10)

I believe the answer is:

vociferous

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'noisy' is the definition.
(similar in meaning)

'of four voices' is the wordplay.
'of' indicates anagramming the letters (the answer comes from or 'of' the letters).
'four'+'voices'='fourvoices'
'fourvoices' anagrammed gives 'VOCIFEROUS'.

'outburst' is the link.
I am not very happy about this link. It may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for vociferous that I've seen before include "Insistently noisy" , "loud" , "Strident" .)

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

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