Bulk liquid carrier (6)
I believe the answer is:
tanker
'bulk liquid carrier' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for tanker that I've seen before include "Vehicle carrying liquid" , "Petrol transporter" , "Oil-carrying vessel" , "Vehicle or ship for carrying oil in bulk" , "Huge ship for transporting oil" .)