Melodious bird (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">melodious bird</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for lark that I've seen before include "Frolic - songbird" , "bit of mischief" , "Bird; prank" , "Early riser" , "Singing bird and piece of harmless mischief" .)
(Other definitions for nightingale that I've seen before include "Bird noted for its song" , "Flier" , "Bird with beautiful song" , "Woman of note" , "Singer in London square" .)