Crossword Genius

Remedy, counteragent (8)

Ross

I believe the answer is:

antidote

I believe this clue is a double definition.

'remedy' is the first definition.
(I know that antidote is a type of remedy)

'counteragent' is the second definition.
(thesaurus)

(Other definitions for antidote that I've seen before include "It makes you feel better" , "Donate it to anti-poison agent" , "Tied to an awful counteracting agent" , "Counterpoison" , "Counteractive medicine" .)

I've seen this clue in The Guardian.
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