The most common and most likely answer to this crossword clue is the 9 letter word BACKWOODS
I've seen this crossword clue in The Guardian
B
A
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More clues leading to the result BACKWOODS
Buddy explains!

The straight part
We know that "forest areas" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case forest areas = backwoods.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 BACKWOODS mean?
BACKWOODS noun- Partly or wholly uncleared forest, especially in North America.
- A remote or sparsely inhabited region, especially in North America; away from big towns and from the influence of modern life.
- Pertaining to the backwoods.
- Rough, uncouth, coarse, or crude in social matters.