Is curious about seven world phenomena (7)
I believe the answer is:
wonders
'seven world phenomena' is the definition.
The definition and answer can be both related to natural events as well as being plural nouns.
Maybe you can see a link between them that I don't see?
'is curious about' is the wordplay.
I cannot really understand how this works, but
'about' could be 'on' (as in a book 'on' a certain topic) and 'on' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for wonders that I've seen before include "Curiosities" , "Prodigies, miracles" , "Questions, marvels" , "Marvels - there used to be seven of them in the world" , "Questons, marvels" .)