Bugbear, bogey (7)
I believe the answer is:
bugaboo
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">bugbear</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that bugbear can be written as bugaboo)</span><br/ ><br/ >'<span class="explanation-format__original">bogey</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for bugaboo that I've seen before include "source of alarm" , "which makes one anxious" , "Bogey" , "Object of anxiety" , "it's awful!" .)