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Unpretentious old medicine (6)

Ross

I believe the answer is:

simple

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This could be a double definition.

'unpretentious' is the first definition.
(similar in meaning)

'old medicine' is the second definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

Can you help me to learn more?

(Other definitions for simple that I've seen before include "Unpretentious" , "Elementary" , "Mean" , "Plant with medicinal properties" , "Easily done" .)

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