Cooper’s product (6)
I believe the answer is:
barrel
'cooper's product' is the definition.
(I've seen this in another clue)
This is all the clue.
(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" .)