Possible Clues:

• Composer of ''The Flying Dutchman''
• "Ride of the Valkyries" composer
• Liszt's son-in-law
• Composer of ''The Flying Dutchman'' etc
• Ring cycle composer
• German composer's English uprising dividing what divided us?
• Composer born 1813
• Composer of the 17-Across
• The composer with the most pages in Nicholas Slonimsky’s Lexicon of Musical Invective
• __ Group, Russian private military contractor