Dove's cry (3)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dove's cry</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for coo that I've seen before include "crumbs" , "Call like a dove" , "Dove's call" , "Make loving sounds -bill and . . ." , "Murmur of a dove" .)