Crossword Genius

Killed, senselessly using some pistols (4)

Ross

I believe the answer is:

lost

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'killed' is the definition.
The answer and definition can be both to do with contact as well as being past participle verbs.
Perhaps there's a link between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for lost that I've seen before include "Unable to be found" , "See 10" , "at sea" , "Mislaid or was defeated" , "See 8" .)

I've seen this clue in the Evening Standard.
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