Crossword Genius

Bird fish in European river avoid (5,4)

Ross

I believe the answer is:

eider duck

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

'bird' is the definition.
(eider duck is a kind of bird)

'fish in european river avoid' is the wordplay.
'fish in european river' becomes 'eider' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'avoid' becomes 'duck' (ducking is a kind of avoiding).
'eider'+'duck'='EIDER DUCK'

Can you help me to learn more?

(Other definitions for eider duck that I've seen before include "Source of soft feathers" , "down supplier" , "A northern sea bird" .)

I've seen this clue in The Times.
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