"Hippolyte et Aricie" composer (6)
I believe the answer is:
rameau
'hippolyte et aricie composer' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rameau that I've seen before include "Jean-Philippe -, seventeenth to eighteenth century French composer" , "13 across baroque composer" , "Jean-Philippe -, French Baroque composer" .)