Impertinently bold (12)
I believe the answer is:
presumptuous
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">impertinently bold</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 presumptuous that I've seen before include "Impertinently bold" , "Impertinent" , "Assuming too much" , "Bold - forward" .)