"Mainstay of a sci-fi defense system" NYT crossword answer is:FORCEFIELD (10 letters length)
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The mainstay of a sci-fi defense system crossword clue from the New York Times (December 3, 2023) is "LASER CANNON". This clue refers to the use of lasers as a form of defense in science fiction, often used to protect a planet or space station from attack. Lasers are a powerful and efficient form of energy, and they can be used to create powerful weapons that can be used to protect a planet or space station from attack. Lasers are also used in many other forms of defense, such as missile defense systems and anti-aircraft systems.