Still-life subject (4)
I believe the answer is:
ewer
'still-life subject' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ewer that I've seen before include "Large water-jug" , "Large pitcher" , "Large, wide-mouthed jug" , "Sort of jug" , "Pitcher, water jug" .)