BMW-produced auto (4)
I believe the answer is:
mini
'bmw-produced auto' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for mini that I've seen before include "Car; short dress" , "Once fashionable skirt" , "Small (of car, skirt, disk,bar or series)" , "Italian Job car?" , "Brief" .)