They sing the praises of various rich stores (10)

I believe the answer is:

choristers

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'they sing the praises' is the definition.
The definition suggests an adverb but the answer is not.

'various rich stores' is the wordplay.
'various' is an anagram indicator.
'rich'+'stores'='richstores'
'richstores' anagrammed gives 'CHORISTERS'.

'of' is the link.

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

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