I managed to take it only one step further, Pld, by assuming that 'once beginning' meant to take the 'o' from 'once'...ie as the opening (beginning) letter thereof. Thus we have an anagram of ECHOERO, giving 'RHEOCO'. Where the unused 'e' goes and where the absent 'rd' comes from, I've no idea! Rheocord is, of course, the 'answer', but I've noticed this sort of 'slackness creeping into the Azed in recent months. I shall, naturally, retract that on this occasion, if someone comes up with an explanation of the seemingly missing/superfluous letters.