Be slow to leave (6)
I believe the answer is:
linger
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">be slow to leave</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 linger that I've seen before include "'Loiter, delay leaving (6)'" , "Be slow to go" , "Delay departure" , "Dally, stay on" , "Leave slowly and hesitantly" .)