Brightly shining (7)
I believe the answer is:
radiant
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">brightly shining</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 radiant that I've seen before include "Effulgent" , "'Glorious, shining (7)'" , "glowing with happiness" , "Very rich (7.2.2)" , "Very conspicuous" .)