Aspect, element (6)
I believe the answer is:
factor
I believe this clue is a double definition.
'aspect' is the first definition.
(I've seen this before)
'element' is the second definition.
(synonyms)
(Other definitions for factor that I've seen before include "Mathematical quantity" , "Circumstance that contributes toward a result - arithmetically?" , "Circumstance that contributes towards a result" , "for a consideration?" , "Contributing influence; business agent" .)