Allowing access (4)
I believe the answer is:
open
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">allowing access</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for open that I've seen before include "Ready for business; spread out; manifest" , "Frank - accessible" , "Traditional room heater" , "See 12" , "Frank; unobstructed" .)