Twins for example overturned car (6)
I believe the answer is:
gemini
'twins' is the definition.
(I've seen this before)
'example overturned car' is the wordplay.
'example' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'overturned' says the letters should be written backwards.
'car' becomes 'mini' (Mini Cooper).
'eg' written backwards gives 'ge'.
'ge'+'mini'='GEMINI'
'for' acts as a link.
(Other definitions for gemini that I've seen before include "Twins star sign" , "set of twinklers" , "Sign of the Twins ( 6)" , "Zodiacal twins" , "lot of stars" .)