Cooper’s product (6)
I believe the answer is:
barrel
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cooper's product</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 barrel that I've seen before include "Oil/beer container" , "''Roll out the ..., let's have a ... of fun'' (WWII song)" , "Wood vessel; part of horse" , "Measure of oil" , "Large keg" .)