Style; behaviour (6)
I believe the answer is:
manner
I believe this is a double definition.
'style' is the first definition.
(I know that style can be written as manner)
'behaviour' is the second definition.
(I know that manner is a type of behaviour)
(Other definitions for manner that I've seen before include "Bearing - fashion" , "Fashion, way" , "Kind, sort" , "Mode" , "Way in which something is done" .)