Typist only partially records what's found in car (6)
I believe the answer is:
piston
'records what's found in car' is the definition.
I can't judge whether this defines the answer.
'typist only partially' is the wordplay.
'partially' says the answer is hidden in the clue.
'PISTON' is hidden within 'typist only'.
Can you help me to learn more?
(Other definitions for piston that I've seen before include "Part of pump" , "Driving rod in engine" , "Block sliding in hollow cylinder in machinery etc" , "Points about driving rod" , "Mechanical device that has a thrusting motion" .)