Wrong line on the map? (4)
I believe the answer is:
nile
'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" .)