Common European standard? (9)
I believe the answer is:
tricolour
This clue could be a double definition.
'common european' is the first definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'standard?' is the second definition.
Can you help me to learn more?
(Other definitions for tricolour that I've seen before include "French national flag" , "Standard of French perhaps" , "Having or involving three colours" .)