The most common and most likely answer to this crossword clue is the 8 letter word BUCKAROO
I've seen this crossword clue in The Times
B
U
C
K
A
R
O
O
More clues leading to the result BUCKAROO
Buddy explains!

The straight part
We know that "Kids play this" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case kids play this = buckaroo.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 BUCKAROO mean?
BUCKAROO noun- A cowboy; specifically, a working cowboy who generally does not partake in rodeos.
- One who sports a distinctive buckaroo style of cowboy clothing, boots, and heritage.
- A style of cowboy boot with a high and uniquely tapered heel.
- A reckless, headstrong person.
- A dollar; a buck.