Skyline (7)
I believe the answer is:
horizon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">skyline</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for horizon that I've seen before include "As far as one can see" , "Skyline" , "As far as the eye can see" , "Distant line" , "Where earth meets sky" .)