Move on all fours (5)
I believe the answer is:
crawl
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">move on all fours</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 crawl that I've seen before include "Scramble on all fours" , "Baby-like advance" , "Progress, slow on land but fast in water" , "make slow progress" , "swarm" .)