Sort of car trader so troubled (8)
I believe the answer is:
roadster
'sort of car' is the definition.
'trader so troubled' is the wordplay.
'troubled' indicates anagramming the letters.
'trader'+'so'='traderso'
'traderso' is an anagram of 'ROADSTER'.
(Other definitions for roadster that I've seen before include "Small open-top car" , "An open car without rear seats" , "sporty vehicle" , "Old car" , "sporty car" .)