Highly-prized possession (8)
I believe the answer is:
treasure
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">highly-prized possession</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 treasure that I've seen before include "Valued friend" , "... Island (R.L.Stevenson)" , "much-loved person" , "Set great store by" , "Value highly" .)