The most common and most likely answer to this crossword clue is the 12 letter word ENCYCLOPEDIC
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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does ENCYCLOPEDIC mean?
ENCYCLOPEDIC adjective- Of or relating to the characteristics of an encyclopedia; concerning all subjects, having comprehensive information or knowledge.
- Relating to or containing descriptive information rather than only linguistic or lexical information; about facts and concepts, and not only a word or term; including proper names, biographical and geographical information and illustrations.