Particular part or feature of something (6)
I believe the answer is:
aspect
'particular part or feature of something' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for aspect that I've seen before include "Particular part or feature of something" , "Prospect, view" , "Demeanour" , "Point of view or appearance" , "'View, perspective (6)'" .)