Not far off (5)
I believe the answer is:
close
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not far off</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 close that I've seen before include "Approaching - tight - finish" , "stuffy" , "Meeting with a UFO?" , "cul-de-sac" , "small quiet road" .)