Powerpuff Girls, for one (4)

I believe the answer is:

trio

(Other definitions for trio that I've seen before include "Beethoven's 'Archduke': famous piece written for this ensemble" , "Work for three" , "wise men?" , "Ensemble musical piece, eg Beethoven's 'Archduke'" , "Threesome" .)

I've seen this clue in the USA Today.

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