The going rate for drugs? (5)
I believe the answer is:
speed
'the going rate' is the definition.
(I've seen this before)
'drugs?' is the wordplay.
I cannot really understand how this works, but
'drugs?' could be 'ee' (I've seen this in other clues) and 'ee' is located in the answer.
This may be the basis of clue (or it may be nonsense).
'for' is the link.
Can you help me to learn more?
(Other definitions for speed that I've seen before include "Rtae of progress" , "'More haste, less . . . . .'" , "Alacrity" , "Rate of travel" , "Rate of movement" .)