Egg hatcher (9)
I believe the answer is:
incubator
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">egg hatcher</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 incubator that I've seen before include "Apparatus for hatching eggs" , "Artificial substitute for a hen's warmth" , "Egg hatching apparatus" , "hospital equipment" , "Promotor of growth" .)