Crossword Genius

Group four times the size of a duo (5)

Ross

I believe the answer is:

octet

(Other definitions for octet that I've seen before include "What takes members up to eighth" , "A number of musicians" , "Work for eight players" , "Eightsome" , "Chamber ensemble, a Mendelssohn favourite" .)

I've seen this clue in the USA Today.
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