Means of moving from one floor to another (9)
I believe the answer is:
staircase
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">means of moving from one floor to another</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 staircase that I've seen before include "Means of moving from one floor to another" , "It's Caesar (anag.)" , "A group of linked canal locks" , "Route between floors" , "Way between floors" .)