Crossword Genius

Wrong line on the map? (4)

Ross

I believe the answer is:

nile

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

'the map?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'wrong line' is the wordplay.
'wrong' indicates an anagram.
'line' with letters rearranged gives 'NILE'.

'on' acts as a link.

Can you help me to learn more?

(Other definitions for nile that I've seen before include "long-distance runner in Africa" , "white flower?" , "River at Luxor" , "White or Blue river of Africa" , "River that's Blue and White" .)

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