Eyeglass (7)
I believe the answer is:
monocle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">eyeglass</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for monocle that I've seen before include "lens" , "One-lens seeing apparatus" , "Single eyeglass" , "Reading glass for one eye only" , "optical device" .)