Soaring songbird (7)
I believe the answer is:
skylark
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">soaring songbird</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 skylark that I've seen before include "Early rising bird" , "Indulge in horseplay" , "Flighty singer" , "Common songbird" , "Play boisterously" .)