I really apologise. In my half awake state I inadvertently posted a clue I was trying to search. Here again is the clue "sort of barrier when children start school with hesitation." 16ac Guardian Prize Crossword 26,950. I have
---t--. I guess the hesitation is "er" at the end of the word. "Filter" is a sort of barrier but I can't see any sense in it. Again my apologies, thank you;