The most common and most likely answer to this crossword clue is the 5 letter word TAIGA
I've seen this crossword clue in The Guardian
T
A
I
G
A
More clues leading to the result TAIGA
- Sound of fierce creature in northern habitat
- In which the beast of Siberia is caught?
- Volunteers to lead a soldier up lots of freezing trees
- Name area outside India’s northern region
- Northern region where dynamic economy picked up
- Forest where you might catch large cat?
- Awkward gait when going over American forest
- Predator caught in northerly forest
- Sound of wildcat in northern forest
- Vast expanse of 8 and one of its denizens, say?
Buddy explains!

The straight part
We know that "northerly forest" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case northerly forest = taiga.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 TAIGA mean?
TAIGA noun- A subarctic zone of evergreen coniferous forests situated south of the tundras and north of the steppes in the Northern Hemisphere.