Not in gear (4)
I believe the answer is:
idle
'not in gear' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for idle that I've seen before include "Monty Python's Eric, b. 1943" , "Not occupied" , "Fruitless" , "Inert; lazy" , "out of a job" .)