Passed as symmetrical (3)
I believe the answer is:
did
'passed' is the definition.
(doing is a kind of passing)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for did that I've seen before include "Executed!" , "Carried out an act" , "Carried out, performed" , "Acted" , "Accomplished" .)