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Lead from pistol puncturing kidneys from behind, assassin hiding (6)

Ross

I believe the answer is:

sniper

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This might be a double definition.

'lead from pistol puncturing' is the first definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'kidneys from behind assassin hiding' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

Can you help me to learn more?

(Other definitions for sniper that I've seen before include "One firing from cover" , "One who criticises" , "One trained to shoot" , "One shoots from a concealed place" , "Person making sly critical remarks, like gunman from hiding?" .)

I've seen this clue in The Telegraph.
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