Running to a car in mac (8)
I believe the answer is:
raincoat
'mac' is the definition.
(I've seen this before)
'running to a car in' is the wordplay.
'running' indicates anagramming the letters.
'to'+'a'+'car'+'in'='toacarin'
'toacarin' is an anagram of 'RAINCOAT'.
(Other definitions for raincoat that I've seen before include "which should keep water out" , "Wet weather wear" , "Protective garment for Croatian" , "Outer garment for Croatian" , "Mac" .)