Question Author
Thank you scorpiojo and emeritus. There doesn't seem to be such an animal as an Australian Ridgeback - just a reference to the Rhodesian Ridgeback used for shepherding sheep in Australia. but I suppose ridgeback would be OK if the clue was "back support" - not bank support. Perhaps it's a typo. If I didn't have my whole head blocked up with a bad cold I might be able to think more clearly. Anyway, many thanks for your help - and a Happy New Year.