Green gemstone (7)
I believe the answer is:
emerald
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">green gemstone</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for emerald that I've seen before include "a type employed by the press" , "Green - jewel" , "city in Oz?" , "Mere lad (anag.)" , "Green variety of beryl" .)