Robbed patrol leader, but editor was on top (9)
'robbed' is the definition.
'patrol leader but editor was on top' is the wordplay.
I cannot quite see how this works, but
'leader' could be 'red' (red is a kind of leader) and 'red' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for plundered that I've seen is "Ransacked".)