Quantities of drugs, say, Rishi smuggled into parties (7)
I believe the answer is:
dosages
'quantities of drugs' is the definition.
'dosages' can be an answer for 'quantities' (dosage is a kind of quantity). I am not certain of the 'of drugs' bit.
'rishi smuggled into parties' is the wordplay.
'rishi' becomes 'sage' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'smuggled into' indicates putting letters inside.
'parties' becomes 'dos' (do is a kind of party).
'sage' put into 'dos' is 'DOSAGES'.
'say' is the link.
Can you help me to learn more?
(Another definition for dosages that I've seen is " measures".)