Move backward (7)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">move backward</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for regress that I've seen before include "Lapse" , "Go back to a lower level" , "Go back to a former state" , "Return or revert" , "Go back to a worse condition" .)