Reddish gem (6)
I believe the answer is:
garnet
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">reddish gem</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 garnet that I've seen before include "Deep red gemstone" , "Hard glassy mineral used as a gemstone" , "Semi-precious stone of deep transparent red" , "Precious stone, usually red" , "Semi-precious stone of argent type" .)