Be too scared to do something (7,3)
I believe the answer is:
chicken out
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">be too scared to do something</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 chicken out that I've seen before include "turn yellow" , "Be too scared to do something" , "Get scared off" , "bottle it" , "vegetarian's decree?" .)