Agriculturalist spoke to drug business (6)
I believe the answer is:
pharma
'agriculturalist spoke' is the definition.
I know nothing about this answer so I can't judge whether this works.
'drug business' is the wordplay.
I cannot really see how this works, but
'drug' could be 'h' (H is an example) and 'h' is found in the answer.
The remaining letters 'parma' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'to' acts as a link.
Can you help me to learn more?
(Another definition for pharma that I've seen is " drugs industry".)