No- that was doing my head in too! It goes to show that using the online "Chambers" word search doesn't always get results- a patient trawl through the print version would have yielded a result.
I don't know whether it's just me, but I've thought that of late the "Speccie" has been gradually becoming a little easier... until 2524 came along. This was a real belter of a puzzle from "Pabulum".