Intriguing object (5)
I believe the answer is:
curio
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">intriguing object</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 curio that I've seen before include "(Unusual) collector's item" , "odd thing" , "Object of interest because it is a rare or unusual" , "Intriguing object worth collecting" , "Something unusual, perhaps worthy of collecting" .)