European river running through Oslo, I realised (5)

I believe the answer is:

loire

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

'european river' is the definition.
(I've seen this before)

'through oslo i realised' is the wordplay.
'through' indicates a hidden word.
'LOIRE' is hidden within 'oslo i realised'.

'running' acts as a link.
I am not very happy about this link. It may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for loire that I've seen before include "flower found amid vineyards" , "Longest French river" , "French department" , "Longest river in France" , "valley famous for its wines" .)

I've seen this clue in The Telegraph.

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