Crossword Genius

One band or another being heard (6)

Ross

I believe the answer is:

troupe

'one band' is the definition.
(I've seen this before)

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

(Other definitions for troupe that I've seen before include "travelling band" , "Travelling company of performers" , "Group of performers" , "Company of theatrical performers" , "A company of actors or acrobats" .)

I've seen this clue in The Times.
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