Crossword Genius

Refrain from tasks requiring English to be universal (6)

Ross

I believe the answer is:

chorus

'refrain' is the definition.
(synonyms)

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

(Other definitions for chorus that I've seen before include "Speak in unison" , "Group of singers as in musicals" , "Singing group - refrain" , "Some chanting" , "Vocal composition" .)

I've seen this clue in The Independent.
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