The consensus is "room" with "ruse" as a ruse :) Coppard was just a young singer (about 23) and was provided concerts and songs/ballads for her recording by Lloyd and MacColl. It's unclear if she changed the text with "ru' " which in my opinion is a reworking of Gales' Norfolk text and not traditional and will not appear on my site. Probably, she sang and printed what she was given- it says "Norfolk" version. I have four versions from Norfolk and they all have "room."