Moving staircase (9)
I believe the answer is:
escalator
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">moving staircase</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for escalator that I've seen before include "nonstop flight" , "Moving staircase" , "Mechanised staircase" , "financial clause" , "the easy way up" .)