Celestial phenomenon (7)
I believe the answer is:
eclipse
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">celestial phenomenon</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 eclipse that I've seen before include "The obscuring of one celestial body by another" , "Dull time for male duck" , "Surpass in achievement" , "Black out" , "Deprive of prominence" .)