Uncommon things (8)
I believe the answer is:
rarities
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">uncommon things</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 rarities that I've seen before include "These are very scarce indeed" , "Uncommon things" , "Scarce and valuable things" , "pearls" , "They're very unusual" .)