The most common and most likely answer to this crossword clue is the 7 letter word DEWFALL
D
E
W
F
A
L
L
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The straight part
We know that "deposition of moisture" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case deposition of moisture = dewfall.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 DEWFALL mean?
DEWFALL noun- The forming of dew.
- The time when dew begins to form.