One giving guidance for the farmer? (6)

I believe the answer is:

tiller

I'm a little stuck... Click here to teach me more about this clue!

'the farmer?' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for tiller that I've seen before include "Bar that turns rudder in small boat" , "Bar that manipulates rudder" , "What boatman uses" , "Horizontal bar to turn rudder" , "Boat steerer" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app