Talks big (6)
I believe the answer is:
boasts
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">talks big</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 boasts that I've seen before include "Brags in praise of oneself" , "Brags, blows" , "crows" , "Brags, shows off" , "Blows one's own trumpet" .)