Slight mistake (5)
I believe the answer is:
lapse
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">slight mistake</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for lapse that I've seen before include "Temporary failure of judgment or concentration" , "moral shortcoming" , "Sepal (anag)" , "Brief failure of judgement" , "Error; oversight" .)