Breathtaking sight (6)
I believe the answer is:
eyeful
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">breathtaking sight</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for eyeful that I've seen before include "One who is well worth looking at" , "A (lovely) sight to behold" , "Attractive sight" , "Gorgeous sight" , "someone beautiful" .)