Crossword Genius

Group twice as big as a quartet (5)

Ross

I believe the answer is:

octet

(Other definitions for octet that I've seen before include "Mendelssohn wrote this" , "Mendelssohn or Schubert piece" , "Group of eight players" , "Work for eight players" , "What takes members up to eighth" .)

I've seen this clue in The Wall Street Journal.
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