Smoke in car, get it fixed before end of race (9)
I believe the answer is:
cigarette
'smoke' is the definition.
(I know that cigarette is a type of smoke)
'car get it fixed before end of race' is the wordplay.
'fixed' indicates an anagram.
'before' is a charade indicator (letters next to each other).
'end of' indicates one should take the final letters.
The last letter of 'race' is 'e'.
'car'+'get'+'it'='cargetit'
'cargetit' with letters rearranged gives 'cigarett'.
'cigarett'+'e'='CIGARETTE'
'in' acts as a link.
(Other definitions for cigarette that I've seen before include "Cylinder of tobacco" , "Tobacco wrapped in paper" , "Fag, smoke" , "tobacco in consumable form" , "harmful in nature" .)