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" .)

I've seen this clue in The Telegraph.

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