Baby's comforter (5)
I believe the answer is:
dummy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">baby's comforter</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 dummy that I've seen before include "Model of a human being" , "Hand played by declarer" , "Clothes shop model" , "Substitute for the real thing" , "Make as if to pass" .)