The most common and most likely answer to this crossword clue is the 5 letter word BEDEW
I've seen this crossword clue in The Times
B
E
D
E
W
Buddy explains!

The straight part
We know that "to sprinkle with water" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case to sprinkle with water = bedew.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 BEDEW mean?
BEDEW verb- To make wet with or as if with dew.