You're ignoring some rule (5)
I believe the answer is:
reign
'rule' is the definition.
(reigning is a kind of ruling)
'you're ignoring some' is the wordplay.
'some' indicates the answer is hidden within the clue.
'REIGN' can be found hidden inside 'youre ignoring'.
(Other definitions for reign that I've seen before include "Prevail" , "Period on the throne" , "Sit on a throne" , "Dominion" , "period in power" .)