Lucifer's narrative arc a natural wonder (5,5)
I believe the answer is:
angel falls
'lucifer's narrative' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'arc a natural wonder' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for angel falls that I've seen before include "great force" , "Drop of water in South America" , "so one fewer in heaven?" , "huge cataract" .)