Performed, taking back gold robot (5)
I believe the answer is:
droid
'robot' is the definition.
(droid can mean a robot)
'performed taking back gold' is the wordplay.
'performed' becomes 'did' ('do' can be a synonym of 'perform').
'taking' indicates putting letters inside.
'back' says the letters should be written in reverse.
'gold' becomes 'or' ('or' is the heraldic name for gold).
'or' reversed gives 'ro'.
'did' going around 'ro' is 'DROID'.
(Other definitions for droid that I've seen before include "small robot" , "automaton" .)