Make sure you have the correct words for X and Y. To begin with I thought, "cut" and "back". But there's more to it than that. X and Y together are a well known agricultural term (separately they are both terms you'd encounter in processing digital photographs - though totally unrelated to the puzzle). It is the action of X and Y which is to be applied to the unclued entries, and in this case happens to be in counterclockwise sequence. If still unsure, just play around for a while with the letters of each unclued entry - what alternatives are there ?