Agriculturist at the helm? (6)
I believe the answer is:
tiller
I believe this is a double definition.
'agriculturist' is the first definition.
(I've seen this in another clue)
'the helm?' is the second definition.
(I've seen this before)
'at' is the link.
(Other definitions for tiller that I've seen before include "steering contraption" , "Lever for turning the rudder" , "Lever for controlling rudder" , "Boat steering gear" , "Horizontal bar to turn rudder" .)