Cavalier (7)
I believe the answer is:
offhand
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cavalier</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for offhand that I've seen before include "Casual; unconcerned" , "Casually rude" , "Of speech, casual or curt" , "Ad lib" , "Brusque" .)