Empty threat (5,5)
I believe the answer is:
paper tiger
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">empty threat</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 paper tiger that I've seen before include "Threatening person that is really ineffectual" , "One misleadingly appearing threatening" , "Something appearing threatening but actually ineffectual" , "One not as fierce as seems" , "empty threat" .)