Soldier's possibly rash tour of the States (6)
I believe the answer is:
hussar
'soldier's' is the definition.
(hussar is a kind of soldier)
'possibly rash tour of the states' is the wordplay.
'possibly' indicates an anagram.
'tour of' means one lot of letters goes inside another.
'the states' becomes 'US' (abbreviation for the United States).
'rash' with letters rearranged gives 'hsar'.
'hsar' placed around 'us' is 'HUSSAR'.
(Other definitions for hussar that I've seen before include "Early Hungarian cavalry man" , "Member of a light cavalry regiment" , "Light cavalryman" , "one often up on a charge" , "Soldier in a light cavalry regiment" .)