Perhaps wealthy farmer is making plan to depose premier, which is a discouraging thing (9)
I believe the answer is:
landowner
This clue might be a double definition.
'perhaps wealthy farmer' is the first definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'plan to depose premier which is a discouraging thing' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'is making' is the link.
Can you help me to learn more?
(Other definitions for landowner that I've seen before include "One with title to an area" , "Owner of an area" , "One with much property" , "Possessor of real estate" , "One possessing estate" .)