The most common and most likely answer to this crossword clue is the 7 plus 4 letter word CHILD’S PLAY
I've seen this crossword clue in The Guardian
C
H
I
L
D
â
€
™
S
P
L
A
Y
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.