Bright star (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bright star</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 nova that I've seen before include "Exploding star" , "Star briefly brightening" , "Star showing a sudden temporary increase in brightness" , "Faint star that suddenly flares into brightness and then fades again" , "Star that becomes much brighter for short time" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bright star</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 sirius that I've seen before include "The Dog Star, brightest of the fixed stars" , "Brightest star in the sky" , "The Dog Star that follows the hunter Orion" , "It's known as the Dog Star" , "The Dogstar" .)