There are two golden rules for an ____: start together and finish together (Thomas Beecham) (9)

I believe the answer is:

orchestra

(Other definitions for orchestra that I've seen before include "Big group of musicians playing various instruments" , "Large group of instrumentalists" , "Instrumental group" , "Theatre area for musicians" , "many players" .)

I've seen this clue in The Sunday Times and The Times.

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