Inquisitive to a fault (4)
I believe the answer is:
nosy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">inquisitive to a fault</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for nosy that I've seen before include "Over-inquisitive" , "Prying, snoopy" , "Inquisitive in nasal manner" , "Showing too much curiosity about people's affairs" , "Inclined to poke into other people's affairs" .)