Draw some great tractor (7)
I believe the answer is:
attract
'draw' is the definition.
(I know that draw can be written as attract)
'some great tractor' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'ATTRACT' is hidden within 'great tractor'.
(Other definitions for attract that I've seen before include "Allure" , "to be appealing" , "Entrance" , "Exert a pull upon" , "Draw, pull" .)