Crossword Genius

Lethal weapon, the arm tossed into river (5-7)

Ross

I believe the answer is:

flame-thrower

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(Other definitions for flame-thrower that I've seen before include "Weapon that sprays burning fuel" , "Weapon using blazing fuel" , "Incendiary weapon" , "Weapon spraying fire" , "Gun firing burning liquid" .)

I've seen this clue in The Telegraph.
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