Boastful threatening (7)
I believe the answer is:
bravado
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">boastful threatening</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 bravado that I've seen before include "Vaunted courage" , "Boldness intended to impress" , "Swaggering show of boldness" , "showing off" , "Swaggering show of false courage" .)