How do you grapple with crossword clues which point out specific letters you have to use in your answer? Naturally, these tricky clues are child's play to Mail Plus's resident crossword masters, Dr Gareth Moore, author of more than 100 successful puzzle and brain training books, and crossword champion Mark Goodliffe, who offer tips and tricks on letter clues this week (based on real-world crossword clues).

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