Answer:

LECOQ

AnswerCrossword Clue
LECOQRimsky-Korsakov's .. d'Or
LECOQRimsky-Korsakov's ".. d'Or"
LECOQGaboriau's detective.
LECOQ"... d'Or"
LECOQ"... d'Or," 1909 opera
LECOQGaboriau's gumshoe
LECOQRimsky-Korsakov opera opener
LECOQGaboriau detective
LECOQClothing line ... Sportif