Crossword Genius

Cleopatra's poisoner found within? (3)

Ross

I believe the answer is:

asp

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'cleopatra's poisoner' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for asp that I've seen before include "This Egyptian killer" , "Joe Blake is Australian species" , "Small viper" , "snake appears" , "something at the zoo" .)

I've seen this clue in The Telegraph.
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