Examples of just what the doctor ordered (5)

I believe the answer is:

doses

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'examples' is the definition.
Although both the answer and definition are plural nouns, I cannot see how they can define each other.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for doses that I've seen before include "Medicine measures" , "Potion portions" , "Specific quantities" , "Gives medicine to" , "Quanitites of medicine" .)

I've seen this clue in the Evening Standard.

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