Cryptic crossword
From Hull AWE
Cryptic crosswords are a type of crossword puzzle mostly found in English-speaking countries (Wikipedia states they are also found in Dutch and Hebrew, and for a more extensive description, see their article).
Here we note merely that cryptic crosswords often make use of homophones and word class confusion to mislead puzzlers.
For example in this clue from Everyman in The Observer "Important zoological area shown in quality book (6, 7)", the puzzler assumes 'book' to mean the noun 'book', meaning a physical object. In fact, the word should be taken as the verb 'to book', meaning 'to reserve'. (This, incidentally, solves the second half of the clue for you.)
