Free from obligation (6)
I believe the answer is:
exempt
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">free from obligation</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 exempt that I've seen before include "Not liable, as others may be" , "Excused - let off" , "Absolved" , "Not subject to an obligation" , "Privileged" .)