Eggs laid in water (5)
I believe the answer is:
spawn
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">eggs laid in water</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for spawn that I've seen before include "generator" , "Give rise to; fish egg" , "Engender" , "Deposit mass of eggs" , "Eggs deposited by amphibians" .)