Be highly noticeable (5,3)
I believe the answer is:
stand out
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">be highly noticeable</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 stand out that I've seen before include "Be conspicuous, or persist in demands" , "Be prominent or superior" , "Distinguish oneself" , "Refuse to agree - project" , "Be conspicuous, or persist in demand" .)