Mislaying (6)
I believe the answer is:
losing
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mislaying</span>' is the definition.<br/ ><span class="explanation-format__explanation">('lose' can be a synonym of 'mislay')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for losing that I've seen before include "Logs in (anag.)" , "Opposite of 9" , "Failing to keep" , "Behind in a competition" , "Spice" .)