Singing quartet in sad disarray! (5)

I believe the answer is:

divas

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'singing' is the definition.
Although both the answer and definition are nouns, they are not in the same form of the noun.

'quartet in sad disarray' is the wordplay.
'quartet' becomes 'IV' (Roman numerals for four).
'in' means one lot of letters goes inside another.
'disarray' indicates an anagram.
'sad' with letters rearranged gives 'das'.
'iv' going within 'das' is 'DIVAS'.

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I've seen this clue in the Evening Standard.

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