Early birds? (8)
(Other definitions for cockcrow that I've seen before include "Dawn as signalled by male fowl" , "Dawn (literary)" , "Dawn as signalled by rooster" , "when night ends" , "early morning" .)
(Other definitions for roosters that I've seen before include "Adult male chickens" , "Domestic cocks" , "poultry" , "fowls" , "Sore sort of male farmyard birds" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">early birds</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 larks that I've seen before include "Frolics" , "guys" , "Cavorting" , "We sing" , "Birds; fun" .)