The most common and most likely answer to this crossword clue is the 3 plus 5 plus 7 letter word WET ONE’S WHISTLE
W
E
T
O
N
E
â
€
™
S
W
H
I
S
T
L
E
Buddy explains!
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.