Eight pints (6)
I believe the answer is:
gallon
'eight pints' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for gallon that I've seen before include "Texans sometimes wear hats to hold ten of them" , "8 pints (or ten in a hat!)" , "Quite a few pints" , "Unit of volume for liquid" , "Eight pints of something" .)