Walk inside (5)
I believe the answer is:
enter
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">walk inside</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 enter that I've seen before include "Pierce" , "Register (as a competitor)" , "Join (for the first time)" , "Come in - penetrate - record" , "Enroll, sign up" .)