Finally get it (3,3,5)
I believe the answer is:
see the light
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">finally get it</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 see the light that I've seen before include "Become converted" , "Gain sudden insight - be religiously converted" , "Realise one's mistake" , "Be born" , "get it?" .)