Do the wise ones have the prescribed amounts? (7)

I believe the answer is:

dosages

'the prescribed amounts?' is the definition.
(I've seen this in another clue)

'do the wise ones' is the wordplay.
'the wise ones' becomes 'sages' (I've seen this in another clue).
'do'+'sages'='DOSAGES'

'have' is the link.

(Another definition for dosages that I've seen is " measures".)

I've seen this clue in the Sydney Morning Herald.

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