Crossword Genius

Managed by mistake to ignore two leaders (5)

Ross

I believe the answer is:

under

'managed by' is the definition.
(as in working 'under' a supervisor or manager)

I don't understand how the remainder of the clue works.

(Other definitions for under that I've seen before include "Subject to the authority of" , "Beneath or subordinate to" , "In a state of unconsciousness" , "Managed by" , "Sub" .)

I've seen this clue in The Times.
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