Stars saving time get small car (6)
I believe the answer is:
gemini
'stars' is the definition.
(constellation)
'saving time get small car' is the wordplay.
'saving' is a deletion indicator (saving can mean except).
'time' becomes 't'.
'small car' becomes 'mini' (I've seen this before).
'get' with 't' taken away is 'ge'.
'ge'+'mini'='GEMINI'
(Other definitions for gemini that I've seen before include "Third zodiacal sign" , "lot of stars" , "space programme" , "Twins star-sign" , "Third sign of the Zodiac" .)