Director of marketing sent back rubbish creative works featuring car (13)
I believe the answer is:
administrator
'director' is the definition.
(thesaurus)
'marketing sent back rubbish creative works featuring car' is the wordplay.
'marketing' becomes 'ad' (advertisement is a type of marketing).
'sent back' says the letters should be written backwards.
'rubbish' becomes 'rot' (both can mean nonsense).
'creative works' becomes 'art' (I've seen this in another clue).
'featuring car' becomes 'sinim' (I can't justify this - if you can you should give a lot more credence to this answer).
'rot'+'art'+'sinim'='rotartsinim'
'rotartsinim' back-to-front is 'ministrator'.
'ad'+'ministrator'='ADMINISTRATOR'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for administrator that I've seen before include "Business organiser" , "One who manages or directs" , "one controls" , "One who manages an organisation" , "I'll manage" .)