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Dose doing away with outsize lady, unexpectedly fatal (6)

Ross

I believe the answer is:

deadly

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'fatal' is the definition.
(similar in meaning)

I can't explain the rest of the clue.

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(Other definitions for deadly that I've seen before include "Belladonna" , "Lethal, could be fatal" , "sniper aspires to be" , "Lethal, capable of causing fatality" , "Lethal, capable of causing fatal injury" .)

I've seen this clue in The Times.
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