Crossword Genius

Identify America? But this is a European river (5)

Ross

I believe the answer is:

tagus

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

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

'identify america?' is the wordplay.
'identify' becomes 'tag' (I've seen this in another clue).
'america?' becomes 'U.S.' (United States).
'tag'+'us'='TAGUS'

'but this is a' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for tagus that I've seen before include "banker" , "Longest river of Iberian peninsular" , "Portugese river" , "Longest river of Iberian peninsula" , "Lisbon's river" .)

I've seen this clue in The Independent.
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