This is the hint.
This book contains one hundred Sunday Times concise crosswords, originally published in 2015, 2016 and 2017 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 small number of clues and one or two answers 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. Puzzle 90 in this book was number 1500 in the printed series, and includes something to mark the milestone. Number 82 has all the down clues starting with the same letter, and there is something else going on elsewhere — I’ll leave you to discover what. Puzzle 92 appears in print for the first time, as it was included in an online-only version of the paper on Sunday 25 December 2016. 50-odd puzzles earlier, you may be able to spot two 2015 puzzles with seasonal messages, once in the clues and once in the grid..
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