Rather eerie (6)
I believe the answer is:
creepy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rather eerie</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 creepy that I've seen before include "Producing fear and unease" , "Rather eerie" , "Causing a feeling of fear or unease" , "Mysterious" , "Hair-raising" .)