Answer: masterwork

AnswerCrossword Clue
MASTERWORKCrowning achievement
MASTERWORKArtist's crowning achievement
MASTERWORKChef d'oeuvre.
MASTERWORKClassic.
MASTERWORKChef-d'oeuvre
MASTERWORKBeethoven's Ninth, e.g.
MASTERWORKPinnacle of fine art
masterworka masterpiece
masterworkA masterpiece