Small car or estate travelling round capital of Wisconsin (3-6)
I believe the answer is:
two-seater
'small car' is the definition.
(I've seen this before)
'or estate travelling round capital of wisconsin' is the wordplay.
'travelling' indicates an anagram.
'round' indicates putting letters inside.
'capital of' says to take the initial letters.
The initial letter of 'wisconsin' is 'w'.
'or'+'estate'='orestate'
'orestate' is an anagram of 'toseater'.
'toseater' enclosing 'w' is 'TWO-SEATER'.
(Other definitions for two-seater that I've seen before include "Small car" , "Sports car" .)