Liquid offering (8)
I believe the answer is:
libation
'liquid offering' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for libation that I've seen before include "Drink poured out as offering to God" , "Drink poured as offering to the gods" , "Liquid offering" , "A serving of an alcoholic beverage" , "Alcoholic drink" .)