Writer in car transported those (6)
I believe the answer is:
crayon
'writer' is the definition.
(I've seen this before)
'car transported those' is the wordplay.
'transported' is an anagram indicator.
'those' becomes 'yon' (historic English pronoun equivalent to 'those').
'car' anagrammed gives 'cra'.
'cra'+'yon'='CRAYON'
'in' acts as a link.
(Other definitions for crayon that I've seen before include "Writer" , "Coloured rod" , "Drawing-stick" , "alternative to charcoal" , "(Draw with) a coloured stick" .)