Bimbo (7)
I believe the answer is:
airhead
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bimbo</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 airhead that I've seen before include "Featherbrain" , "Bimbo" , "Dope" , "Fool" , "Idiot" .)