
1) Broadway musical 2) Hired guns 3) Hit men 4) Hitmen 5) Killer musical by Sondheim 6) Killers 7) Lee Harvey Oswald and others 8) Ninjas 9) Professional offers 10) Some mercenaries
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1) Killers
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https://www.crosswordclues.com/clue/assassins

The Assassins (from حشّاشين Ḥashshāshīn) were an order of Nizari Ismailis, particularly those of Persia and Syria, that formed in the late 11th century. In time, the order began to pose a strong military threat to Sunni Seljuq authority within the Persian territories by capturing and inhabiting many mountain fortresses under the leaders...
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http://en.wikipedia.org/wiki/Assassins
[musical] Assassins is a musical with music and lyrics by Stephen Sondheim and book by John Weidman, based on an idea by Charles Gilbert, Jr. It uses the premise of a murderous carnival game to produce a revue-style portrayal of men and women who attempted (successfully or not) to assassinate Presidents of the United States. The music varie...
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http://en.wikipedia.org/wiki/Assassins_(musical)

The Assassins were an Asiatic order or society having the practice of assassination as its most distinctive feature. The Assassins were founded by Hassan Ben Sabbah, a dai or missionary of the heterodox Muslim sect the Ishmaelites. The society grew rapidly in numbers, and in 1090 the Persian fortress of Alamut fell into their hands. Other territori...
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assassins A slew of assassins.
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http://www.wordinfo.info/words/index/info/view_unit/3676/2
No exact match found.