Amount of drugs given by guru after party (6)
I believe the answer is:
dosage
'amount of drugs' is the definition.
'dosage' can be an answer for 'amount' (dosage is a kind of amount). I'm not certain of the 'of drugs' bit.
'guru after party' is the wordplay.
'guru' becomes 'sage' (synonyms).
'after' is a charade indicator (letters next to each other).
'party' becomes 'do' (do can informally mean a party).
'sage' after 'do' is 'DOSAGE'.
'given by' acts as a link.
Can you help me to learn more?
(Other definitions for dosage that I've seen before include "The giving of medication in prescribed amount" , "Correct use of a prescribed drug" , "measure" , "Giving of medicine in prescribed amount" , "Measured amount of medicine to be taken" .)