Emerge (6)
I believe the answer is:
appear
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">emerge</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 appear that I've seen before include "Become visable" , "be published" , "Turn up" , "hove in sight" , "Seem - come into view" .)