One might provide over-optimistic worldview? (4,6)

'one' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'provide over-optimistic worldview?' is the wordplay.
I cannot quite see 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 found in the answer.
This may be the basis of the clue (or it may be nonsense).

'might' is the link.

Can you help me to learn more?