Liquid container (3)
I believe the answer is:
vat
'liquid container' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for vat that I've seen before include "Large barrel" , "Deep tank or tax duty" , "Large tank; purchase tax" , "possible source of liquid" , "subject of 17, 8 [CHANCELLORS STATEMENT]" .)