Amount that will suffice for a wise person (6)
I believe the answer is:
dosage
'amount that will' is the definition.
'dosage' can be an answer for 'amount' (dosage is a kind of amount). I'm unsure of the rest of the definition.
'suffice for a wise person' is the wordplay.
'suffice' becomes 'do' (synonyms).
'for' says to put letters next to each other.
'a wise person' becomes 'sage' (sage can mean a wise or holy person).
'do'+'sage'='DOSAGE'
Can you help me to learn more?
(Other definitions for dosage that I've seen before include "Correct use of a prescribed drug" , "Measured portion of medicine" , "Prescribed amount of drug" , "Giving of medicine in prescribed amount" , "Administered amount of drug" .)