Does wrong, but just the right amount (4)
I believe the answer is:
dose
'amount' is the definition.
(dose is a kind of amount)
'does wrong but just the right' is the wordplay.
'does' anagrams to 'DOSE'.
Though, I'm not sure how this is indicated.
Can you help me to learn more?
(Other definitions for dose that I've seen before include "Prescribed amount of medicine" , "Medicinal amount" , "Measured amount of medicine" , "Amount of medicine to be taken at one time" , "Measure (med.)" .)