Cockerel (7)
I believe the answer is:
rooster
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cockerel</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 rooster that I've seen before include "Early-morning caller" , "Domestic cock" , "Crowing bird" , "One crows" , "So retro (anag.)" .)