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 in another clue)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(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.

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