Go inside (5)
I believe the answer is:
enter
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">go 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 "Register formally as a participant" , "put in for a race" , "Gain admission" , "Register (as a competitor)" , "Record - stage direction - come in" .)