Garden creeper (5)
I believe the answer is:
snail
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">garden creeper</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 snail that I've seen before include "Sluggish person - kind of mail" , "Edible terrestrial mollusc" , "Common garden mollusc" , "Slow-moving garden pest" , "Proverbially slow-moving mollusc" .)