Quits plaza (6)
I believe the answer is:
square
I believe this is a double definition.
'quits' is the first definition.
(both can mean even or resolved)
'plaza' is the second definition.
(I know that plaza can be written as square)
(Other definitions for square that I've seen before include "See 11" , "bashed by soldiers in training?" , "uncool" , "Figure with four equal sides" , "Series of steps with four couples" .)