Abound (4)
I believe the answer is:
teem
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">abound</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for teem that I've seen before include "Abound - pour" , "Rain hard" , "Abound, swarm with" , "Rain cats and dogs" , "(Of rain) fall heavily" .)