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Those in Brussels using a lot of words to describe 'eyebright' (8)

Ross

I believe the answer is:

euphrasy

I'm a little stuck... Click here to teach me more about this clue!

'eyebright' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see an association between them that I don't see?

'those in brussels using a lot of words to describe' is the wordplay.
I cannot really see how this works, but
'brussels' could be 'eu' (Brussels is a metonym for the European Union) and 'eu' is located in the answer.
'a' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent.
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