The most common and most likely answer to this crossword clue is the 11 letter word LOW-PITCHED
I've seen this crossword clue in Independent
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More clues leading to the result LOW-PITCHED
Buddy explains!

The straight part
We know that "Deep/snow settles more easily on such a roof" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case deep/snow settles more easily on such a roof = low-pitched.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 LOW-PITCHED mean?
LOW-PITCHED adjective- Of a sound, having a comparatively low pitch.