Eightsome (5)

I think it could be either:

octet

octad

'eightsome' is the definition.
(I know that eightsome can be written as octet)

This is the entire clue.

(Other definitions for octet that I've seen before include "Played" , "Musical composition for eight performers" , "Lines of verse" , "Group of eight musicians" , "Mendelssohn wrote this" .)

I've seen this clue in the Universal, The Irish Independent, The Telegraph, The Sun and the New York Times.

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