Crawled (4,2,3,5)
I think it could be either:
went on all fours
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">crawled</span>' is the definition.<br/ ><span class="explanation-format__explanation">('creep' can be a synonym of 'crawl')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for crept that I've seen before include "was obsequious" , "Moved slowly with stealth and caution" , "Moved stealthily" , "cringed" , "Sneaked" .)