This is the hint.
This book contains one hundred Sunday Times concise crosswords, originally published in 2013, 2014 and 2015 all set by Dean Mayer. They maintain our established challenging style, moderated by the crossword editor when he thinks something is too difficult or has a bright idea. The versions you see here are as originally printed, apart from a single-digit number of clues amended this time around.
Although the puzzles are meant to be challenging, they are intended to be solved without help from a dictionary except for occasional tricky answers. If you need one, Collins English Dictionary should suffice, unless a proper noun answer is not part of its encyclopaedic content. As in all crosswords with mostly definition-based clues, there will be clues for which more than one answer is possible, so it’s best to look for a clearly unique answer or a unique possible combination of crossing answers as the first to write in.
Some of the puzzles include minor themes, but not as often as similar ones in The Times. Examples I found by looking through the re-solved copies used in preparing this book include one puzzle with four different answers sharing the same clue, one with phrases including the unchecked letters in the top and bottom rows, one with a small “modern-day language theme, one with “edge” answers including their positions, and one with an ingenious reduction of the apparent difficulty produced by pairs of successive unchecked letters in answers.
I would like to thank Dean Mayer for proofreading the puzzles, but as the editor, responsibility for any mistakes is mine.
Sunday Times Crossword Editor