European flower used by panel beaters (4)

I believe the answer is:

elbe

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

'european flower' is the definition.
'elbe' can be an answer for 'flower' (river in Germany). I'm not sure about the 'european' bit.

'used by panel beaters' is the wordplay.
'used by' says the answer is hidden in the clue.
'ELBE' can be found hidden inside 'panel beaters'.

Can you help me to learn more?

(Other definitions for elbe that I've seen before include "River rising in the Czech Republic and flowing into the North Sea" , "Current" , "German banker" , "River of Germany" , "A major German river" .)

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