Jack's container (4)
I believe the answer is:
pail
'jack's container' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for pail that I've seen before include "Cylindrical vessel" , "it may go down well" , "Kind of bucket - ask Jack and Jill" , "Water carrier" , "Milkmaid's bucket?" .)