Car-engine part (4)
I believe the answer is:
hose
'car-engine part' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hose that I've seen before include "Flexible pipe for liquid" , "footwear" , "Socks and stockings" , "Breeches (worn with a doublet)" , "Water pipe" .)