Profits from spiking drinks with Adderall, primarily (5)
I believe the answer is:
gains
'profits' is the definition.
('gain' can be a synonym of 'profit')
'drinks with adderall primarily' is the wordplay.
'drinks' becomes 'gins' (gin is a kind of drink).
'with' indicates putting letters inside.
'primarily' suggests taking the first letters.
The first letter of 'adderall' is 'a'.
'gins' placed around 'a' is 'GAINS'.
'from spiking' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for gains that I've seen before include "Profits" , "Wins" , "Narrows the gap" .)