Datum about European aspect (5)
I believe the answer is:
facet
This clue could be a double definition.
'datum' is the first definition.
(thesaurus)
'european aspect' is the second definition.
'facet' can be an answer for 'aspect' (synonyms). I'm not sure about the 'european' bit.
'about' is the link.
Can you help me to learn more?
(Other definitions for facet that I've seen before include "Aspect or feature of something" , "Side or surface, diamond or building" , "Gem's cut side" , "Flat surface on a cut gem" , "Look" .)