Louis-Hector __, French composer known for his Symphonie fantastique (7)

I believe the answer is:

berlioz

(Other definitions for berlioz that I've seen before include "Composer of The Damnation of Faust, d. 1869" , "French composer of "Symphonie fantastique"" , "Hector --, French composer" , "One composer" , "French composer,1803-69" .)

I've seen this clue in The Guardian.

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