Drug dealer's growing business support, you might say (10)
I believe the answer is:
pharmacist
'drug dealer's' is the definition.
(I've seen this before)
'growing business support you might say' is the wordplay.
I cannot really see how this works, but
'support' could be 'arm' (arm is a kind of support) and 'arm' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for pharmacist that I've seen before include "Drug dealer" , "Drugs dispenser" , "One who dispenses medicines" , "Drug dispenser" , "Medicine dispenser" .)