Copious quantity (3)
I believe the answer is:
sea
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">copious quantity</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 sea that I've seen before include "Great expanse of water" , "The drink" , "one may be pounding the beach" , "Lesser ocean" , "The briny" .)