Thug leaves High Court with those who are likely to sing (5)

I believe the answer is:

choir

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'sing' is the definition.
(I know this)

I don't understand how the remainder of the clue works.

(Other definitions for choir that I've seen before include "Vocalists in group" , "People in church" , "Vocal group" , "warblers" , "Singers in harmony" .)

I've seen this clue in The Irish Times.

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