The most common and most likely answer to this crossword clue is the 8 letter word SNOWLINE
I've seen this crossword clue in The Guardian
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Buddy explains!
The straight part
We know that "White area over here" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case white area over here = snowline.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 SNOWLINE mean?
SNOWLINE noun- The altitude, in a mountainous region, above which the ground is covered with snow, at any particular time.
- The inner limit where volatile molecules can remain frozen in the zone around a star
- By restriction, the limit for water remaining solid instead of evaporating away under solar radiation