Cultivators' levers (7)
I believe the answer is:
tillers
I believe this clue is a double definition.
'cultivators'' is the first definition.
('tiller' can be a synonym of 'cultivator')
'levers' is the second definition.
(tiller is a kind of lever)
(Other definitions for tillers that I've seen before include "gardeners" , "Steering bars" , "Levers to turn rudders" .)