Pieces of eight (6)

I believe the answer is:

octets

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'pieces' is the definition.
(octet is a kind of piece)

I don't understand the rest of the clue.

(Other definitions for octets that I've seen before include "Groups of eight, often singers" , "groups of eight, say singers" , "Groups of eight peformers" , "Sets of eight" .)

I've seen this clue in the King Feature Syndicate, the Universal, the Evening Standard, the New York Times and the Wall Street Journal.

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