Crossword Genius

Offering impossible for teetotallers? (8)

Ross

I believe the answer is:

libation

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'offering' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for libation that I've seen before include "A serving of an alcoholic beverage" , "Drink poured as offering to the gods" , "Drink poured out as offering to God" , "Drink-offering" , "Liquid offering" .)

I've seen this clue in The Irish Independent.
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