At liberty (4)
I believe the answer is:
free
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">at liberty</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for free that I've seen before include "Release - without charge" , "Not working" , "Let loose" , "without payment" , "Not employed" .)