The most common and most likely answer to this crossword clue is the 4 plus 4 letter word TUCK SHOP
I've seen this crossword clue in The Times
T
U
C
K
S
H
O
P
More clues leading to the result TUCK SHOP
Buddy explains!
The straight part
We know that "to which the children flock" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case to which the children flock = tuck shop.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.