It's done at random for medicinal purposes (9)

I believe the answer is:

antidotes

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'medicinal purposes' is the definition.
Although both the answer and definition are plural nouns, I don't understand how one could define the other.

'it's done at random' is the wordplay.
'random' indicates anagramming the letters.
'its'+'done'+'at'='itsdoneat'
'itsdoneat' is an anagram of 'ANTIDOTES'.

'for' is the link.

Can you help me to learn more?

(Other definitions for antidotes that I've seen before include "Counteractions to poisons" , "Remedies" , "Cures for poisons" .)

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

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