The trios Esther composed (6)
I believe the answer is:
threes
'the trios' is the definition.
('three' can be a synonym of 'trio')
'esther composed' is the wordplay.
'composed' indicates an anagram.
'esther' is an anagram of 'THREES'.
(Another definition for threes that I've seen is " Triads, troikas, triplets".)
I've seen this clue in the Evening Standard.
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