It helps to guide one cultivating crops (6)
I believe the answer is:
tiller
'it helps' is the definition.
The definition suggests a singular noun which matches the answer.
'to guide one cultivating crops' is the wordplay.
I cannot really understand how this works, but
'to' could be 'til' (I've seen this in another clue) and 'til' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for tiller that I've seen before include "Boat steering gear" , "Shoot" , "Lever to move a boat's rudder" , "dancing girl?" , "Boat's steering bar" .)