Crossword Genius

An under-nine play group (5)

Ross

I believe the answer is:

octet

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'group' is the definition.
(group of eight musicians)

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

Can you help me to learn more?

(Other definitions for octet that I've seen before include "A number of musicians" , "music group" , "Piece for eight players" , "Work for eight players" , "Eightsome" .)

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