Other indicator words are “receding,” “in the mirror,” “going the wrong way,” “returns,” “reverses,” “to the left” or “left” (for across clues), and “rising,” “overturned” or “mounted” or “come up” (for down clues). It is very common for a clue to use more than one wordplay method. For example, there are many types of word games, such as anagrams and double definitions, but they fit all the rules. Crosswords do their best to follow these rules when writing their instructions, and Solver can use these rules and conventions to help them solve clues. The famous cryptic Setter Derrick Somerset Macnutt (who wrote under the pseudonym Ximenes Kryptik) discusses the meaning and art of just ignorance in his pioneering book on cryptic crossword puzzles, Ximenes on the art of crossword puzzles (1966, reprinted in 2001).  Here, the composer wants to be the answer “Derby,” with “a” definition, “could” be the anagram indicator, and “be dry” the anagram lining. “Derby” is an anagram of “be dry.” But “be” does double duty, which means that any attempt to enigmatically read the word “[definition] [anagram indicator] [fodder]” fails: if “be” is part of the anagram indicator, then the lining is too short, but if it is part of the forage, there is no anagram; to give a correct indication, it should be “a maybe dry (5)” which is not grammatical. A variant could read hat is dry (5), but this also fails because the word “to,” which is necessary to render the sentence grammatical, follows the indicator (“reveals itself”), although it is not specified in the anagram. Another type of abbreviation in the indications may be the words that refer to the letters. For example, “you” refers to the letter U, “why” refers to the letter Y, etc. For example, here is an example (from the Guardian`s crossword puzzle of August 6, 2002, by “Shed”).
Research on the cryptic crossword solution was relatively populated. Several discrete areas have been studied: cognitive or linguistic challenges arising from cryptic indications. the mechanisms by which the “Aha!” -Moment is triggered by the resolution of encrypted crosswords;  the use of cryptic crossword puzzles to maintain cognitive flexibility (“use-it-or-lose-it”) in aging populations; and expert studies on high performance drivers and the ability to solve cryptography.    There are many “code words” or “indicators” that have special meaning in the context of cryptic crossword puzzles.