Infant school (12)
I believe the answer is:
kindergarten
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">infant school</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for kindergarten that I've seen before include "minor institution" , "Hamburger's first class" , "Pre-school institution for little children" , "Where master may be" , "Nursery school" .)