I hope it's not giving too much away to make it clear that once you have identified the 5 superfluous words in the clues, you then have to find them (all across on the left) within the completed grid. The words located in the grid are the ones you have to operate upon. You don't need to get the scissors out yet, but, once you've identified (all across on the right) the book title (6, 6) and the author (1,1, 7) and googled same, you'll see why the "Blue Peter" skills and highlighters will come in handy.