Free (from an obligation) (6)
I believe the answer is:
exempt
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">free from an obligation</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 exempt that I've seen before include "not expected to pay" , "Not liable to, excused" , "Grant immunity" , "Free (from taxes, etc)" , "Release" .)