The most common and most likely answer to this crossword clue is the 8 letter word PEEKABOO
I've seen this crossword clue in The Times
P
E
E
K
A
B
O
O
More clues leading to the result PEEKABOO
- After exercise, rings cook about game for children
- Keep going round a boot, mostly in infantile game
- Play for children? See, it gets disapproval
- Wee-wee, then sound of explosion dropping rear for baby’s amusement
- Quiet cry followed by a surprising noise during children’s game
- Reportedly top American voiced disapproval in child’s game
- Carry on raising a sound of disapproval for game
- It’s fun for tot to stay up with a short thing to read
- Hold back an expression of disapproval in play
- Go and reserve a cycling activity for one’s baby
Buddy explains!

The straight part
We know that "game for children" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case game for children = peekaboo.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 PEEKABOO mean?
PEEKABOO noun- (games) A game for a small child in which one covers one's face, then suddenly reveals it, saying "Boo!" or "Peekaboo!".
- To peep out.
- (of clothing) with holes, slits or transparent fabric to reveal what is normally hidden.
- Boo (when showing oneself unexpectedly)