Unrestricted (4)
I believe the answer is:
open
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unrestricted</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 open that I've seen before include "Start - frank" , "Undo; ready for business" , "Golf tournament" , "Affording access" , "Candid or unlocked" .)