Clear quartz (7)
I believe the answer is:
crystal
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">clear quartz</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for crystal that I've seen before include "Globe for the fortune-teller" , "Type of clear-cut, lucent glass" , "The fortune teller may use a . . . . . . . ball" , "Quality glass" , "Quartz, for example" .)