Crossword Genius

Tablet quietly makes one sick (4)

Ross

I believe the answer is:

pill

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'tablet' is the definition.
(synonyms)

I don't understand the remainder of the clue.

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(Other definitions for pill that I've seen before include "Form of medicine" , "Pellet of medicine" , "Medicinal pellet" , "Dreadful person" , "Lozenge" .)

I've seen this clue in The Irish Times.
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