Like some rulers dismissing a risk (7)
I believe the answer is:
imperil
'risk' is the definition.
(I've seen this in another clue)
'like some rulers dismissing a' is the wordplay.
'like some rulers' becomes 'imperial' (I've seen this before).
'dismissing' suggests deleting specific letters.
'imperial' with 'a' removed is 'IMPERIL'.
(Other definitions for imperil that I've seen before include "Place in danger" , "Threaten, jeopardise" , "Put in danger" , "Jeopardize" , "Put at risk" .)