Sort it out with posh visitor (7)
I believe the answer is:
tourist
'visitor' is the definition.
(I've seen this in another clue)
'sort it out with posh' is the wordplay.
'out with' indicates anagramming the letters (out can mean wrong or inaccurate).
'posh' becomes 'u' (abbreviation for upper-class - opposite to non-U).
'sort'+'it'='sortit'
'sortit' mixed up with 'u' can make 'TOURIST'.
(Other definitions for tourist that I've seen before include "Cheap travel class" , "One travels for pleasure" , "Holiday visitor" , "Sightseeing traveller" , "Traveller for pleasure" .)