Sentence:  New bugs at Winchester can still buy "Winchester Notions", which lists the school's slang. Invaluable if you want to translate something like ‘First-year boys, not in college but keen on exercise, will take part in the cross-house matches after half-term, before evening prep, under the supervision of all masters, the governing body, and the two joint heads of school.' In Winchester slang, that reads, ‘For Commoners looking for <WSD>Ekker</WSD>, Winkies in Cloister Time for the Junior Part will be held after Leave Out, before Toytime, in the presence of all Dons, the Go. Bo., the Aul. Prae and the Sen. Co. Prae.' 
Meaning of the word marked with <WSD> tags:  Physical activity intended to improve strength and fitness.