Pretty — spectacular (6)
I believe the answer is:
scenic
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">pretty</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">spectacular</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for scenic that I've seen before include "Offering pleasant views, say route" , "Dramatic, theatrical" , "Having attractive views like some routes" , "They are usually the long way round!" , "Like an attractive view" .)