Prepared as Venus de Milo once was (5)
I believe the answer is:
armed
'prepared' is the definition.
(I've seen this in another clue)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for armed that I've seen before include "Provided with weapons" , "Dream about carrying weapons" , "Carrying a gun" , "with Browning?" , "With a piece" .)