An interfering person (8)
I believe the answer is:
busybody
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">an interfering person</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for busybody that I've seen before include "One minds everyone else's business" , "A meddlesome person, certainly not idle" , "butter in" , "One meddling" , "Prying person" .)