The most common and most likely answer to this crossword clue is the 12 letter word SUBCONTINENT
I've seen this crossword clue in The Guardian
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More clues leading to the result SUBCONTINENT
Buddy explains!
The straight part
We know that "very large area" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case very large area = subcontinent.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 SUBCONTINENT mean?
SUBCONTINENT noun- A large landmass which is either smaller than a continent (such as Greenland), or part of an even larger continent (such as the Indian subcontinent).
- The Indian subcontinent, South Asia.