Crossword Genius

Do be wise in the use of medicine! (6)

Ross

I believe the answer is:

dosage

I'm a little stuck... Click here to teach me more about this clue!

'use of medicine' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'do be wise' is the wordplay.
'be wise' becomes 'sage' (similar in meaning).
'do'+'sage'='DOSAGE'

'in the' is the link.

Can you help me to learn more?

(Other definitions for dosage that I've seen before include "Correct use of a prescribed drug" , "amount of 14 [WONDER DRUG], say" , "Measured portion of medicine" , "Sea dog (anag)" , "Measured amount of medicine to be taken" .)

I've seen this clue in the Evening Standard.
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