Draws revolutionary in study (4)
I believe the answer is:
swot
'study' is the definition.
(swotting is a kind of studying)
'draws revolutionary' is the wordplay.
'draws' becomes 'tows' (tow is a kind of draw).
'revolutionary' says the letters should be written in reverse.
'tows' reversed gives 'SWOT'.
'in' is the link.
(Other definitions for swot that I've seen before include "Intensive studier" , "One studying too much" , "Student who studies too hard" , "Excessively studious pupil" , "Study intensively for an exam" .)