One last drink (7)

I believe the answer is:

hemlock

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'one last drink' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

This is all the clue.

Can you help me to learn more?

(Other definitions for hemlock that I've seen before include "Poisonous plant" , "Highly poisonous relative of parsley" , "Poisonous weed" , "Poisonous drug" , "Socratic poison" .)

I've seen this clue in the Evening Standard.

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