Another name for Sirius (3,4)
I believe the answer is:
dog star
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">another name for sirius</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 dog star that I've seen before include "Sirius in the sky" , "clearly visible shiner" , "'Another name for the Sirius constellation (3,4)'" , "Canine constellation" , "slightly flashy night-spot?" .)