It sounds alarmingly like poison (6)

I believe the answer is:

tocsin

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'it sounds alarmingly like poison' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

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(Other definitions for tocsin that I've seen before include "One sounds an alarm" , "Warning bell" , "An alarm bell or signal" , "Alarm bell to be found in Scot" , "alarm call" .)

I've seen this clue in The Globe and Mail.

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