Games a police chief overheard in thick fog (3-6)

I haven't cracked this one yet — but the brilliant team at Times for the Times have:

Games in school are/is/were PE. A police Chief Superintendent can be abbreviated to A Super. Which sounds like a SOUPER. In the days when everyone had a coal fire, the resulting mix of fog and smoke led to particularly impenetrable miasmas, likened humorously to pea soup.