November's birthstone (5)
I believe the answer is:
topaz
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">november's birthstone</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 topaz that I've seen before include "Silicate gemstone" , "Yellowish-brown gemstone" , "Precious stone - dark yellow colour" , "White/colourless mineral used as a gemstone" , "valuable item" .)