Able to be seen (7)
I believe the answer is:
visible
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">able to be seen</span>' is the definition.<br/ ><span class="explanation-format__explanation">(something visible can be seen)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for visible that I've seen before include "Capable of being seen" , "In view" , "Able to be seen" , "In sight" , "Perceptible by the eye" .)