Sort it out to accommodate posh visitor (7)
I believe the answer is:
tourist
'visitor' is the definition.
(I've seen this in another clue)
'sort it out to accommodate posh' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'to accommodate' means one lot of letters goes inside another.
'posh' becomes 'u' (abbreviation for upper-class - opposite to non-U).
'sort'+'it'='sortit'
'sortit' is an anagram of 'torist'.
'torist' enclosing 'u' is 'TOURIST'.
(Other definitions for tourist that I've seen before include "Traveller for pleasure" , "Person travelling for pleasure" , "Cheap travel class" , "One travels for pleasure" , "Visiting sightseer" .)