Farm alarm (7)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">farm alarm</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 rooster that I've seen before include "Crowing bird" , "one going to sleep" , "Farmyard fowl" , "One crows" , "American cock" .)