what this clue is in

The phrase "this clue is in" generally refers to the context or source where a particular clue is found. However, based on the search results, it seems there is no direct or common phrase "this clue is in" with a standalone meaning. The closest relevant information relates to the idiomatic use of "clue in," which means to inform someone or give them necessary or new information about something. If the question is about what "this clue is in," it might refer to the source or the puzzle type where a clue is provided, such as a crossword or a riddle. For example, the phrase "what this clue is in" could relate to what puzzle or game the clue belongs to. If the intention was to understand the phrase "clue me in" or "clue someone in," it means to bring someone up to date or explain a situation to them. Could you please clarify if you are asking about the meaning of the phrase "this clue is in," the context of a specific clue, or the idiomatic use of "clue in"? This will help provide a precise answer.