Crossword Genius

Fancy an idea containing this, for example (6)

Ross

I believe the answer is:

poison

'fancy an idea containing this for example' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

(Other definitions for poison that I've seen before include "Toxic substance" , "Substance that damages tissues or causes death" , "Bane" , "I spoon up the lethal substance" , "Corrupt" .)

I've seen this clue in The Guardian.
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