Teaching both girls and boys (2-2)
I believe the answer is:
co-ed
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">teaching both girls and boys</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 co-ed that I've seen before include "Teaching attended by both sexes" , "School for both sexes" , "Teaching both girls and boys" , "School for boys and girls, in short" .)