Useful quality (5)
I believe the answer is:
asset
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">useful 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 "Item conferring advantage" , "Part of motor vehicle wheel" , "Useful item" , "Tessa (anag)" , "Useful thing or person" .)