In cars, they’re generally forward (5)
I believe the answer is:
gears
This could be a double definition.
'in cars' is the first definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps there's an association between them I don't understand?
'generally forward' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'they're' is the link.
Can you help me to learn more?
(Other definitions for gears that I've seen before include "Sarge (anag.)" , "Rages (anag.)" .)