Children's room (7)
I believe the answer is:
nursery
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">children's room</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for nursery that I've seen before include "Creche" , "facility for learners" , "but not elders?" , "Race for horses that are two" , "Growing environment for plants or children" .)