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Deadly cannon finally changing hands (6)

Ross

I believe the answer is:

mortal

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'deadly' is the definition.
(synonyms)

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(Other definitions for mortal that I've seen before include "Certain to die" , "Destined to die" , "Human - transitory" , "Sound a wound is deadly" , "Causing death" .)

I've seen this clue in The Times.
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