Useful or valuable quality (5)
I believe the answer is:
asset
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">useful or valuable quality</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 asset that I've seen before include "- - -stripper" , "Item of property" , "Resource; advantage" , "A possession of some value" , "It's an advantage to declare" .)