Going in (8)
I believe the answer is:
entering
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">going in</span>' is the definition.<br/ ><span class="explanation-format__explanation">('enter' can be a synonym of 'go in')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for entering that I've seen before include "Starting" , "Going/coming in" , "Coming in" , "Going inside" .)