Cleopatra's poisoner found within? (3)
I believe the answer is:
asp
'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" .)