Getting a 9.2-inch Royal Navy cruiser into wartime service

How could the Royal Navy field a 9.2-inch heavy cruiser in time to avoid the postwar cancellation cycle, and what would it displace?

It would need to start in 1939 and would probably consume resources otherwise used for Crown Colony-class light cruisers.

Construction would have to begin in 1939 for a 9.2-inch cruiser to survive the postwar cancellation environment. The project would probably replace Crown Colony-class light cruisers instead of appearing in addition to them. This makes the counterfactual a choice between competing cruiser programs and shipyard resources.