Some are ignoring rule (5)
I believe the answer is:
reign
'rule' is the definition.
(I know that reign is a kind of rule)
'some are ignoring' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'REIGN' is hidden within 'are ignoring'.
(Other definitions for reign that I've seen before include "Sovereign's rule" , "Hold sway, rule" , "Sit on a throne" , "Time on throne" , "Wield the sceptre" .)