Telescope (8)
I believe the answer is:
spyglass
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">telescope</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that spyglass is a type of refracting telescope)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for spyglass that I've seen before include "Aid to pirate, perhaps" , "he can see through it!" , "Viewing aid" , "viewer" , "that magnifies" .)