Facet, feature (6)
I believe the answer is:
aspect
I believe this clue is a double definition.
'facet' is the first definition.
(synonyms)
'feature' is the second definition.
(feature can mean a quality or aspect of something)
(Other definitions for aspect that I've seen before include "Viewpoint, feature to be considered" , "Particular or distinct element, of a problem say" , "Point of view or appearance" , "'Scene, view, vista (6)'" , "Particular part or element, of a problem say" .)