Be frightened of (4)
I believe the answer is:
fear
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">be frightened of</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for fear that I've seen before include "Be afraid of" , "Cutting edge" , "Respect" , "Fright" , "Terror" .)