One might provide over-optimistic worldview? (4,6)
I believe the answer is:
rose window
'one' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'provide over-optimistic worldview?' is the wordplay.
I cannot really understand how this works, but
'provide' could be 'do' (do can mean to provide or serve up) and 'do' is found within the answer.
'over' could be 'o' (cricket abbreviation) and 'o' is located in the answer.
This explanation may well be incorrect...
'might' is the link.
Can you help me to learn more?
(Other definitions for rose window that I've seen before include "feature in church" , "Light" .)