The sightseer is wandering, I trust, round inside (7)
I believe the answer is:
tourist
'the sightseer' is the definition.
(someone visiting certain sights)
'wandering i trust round inside' is the wordplay.
'wandering' indicates an anagram.
'round' becomes 'o' (o is a circular letter).
'inside' means one lot of letters goes inside another.
'i'+'trust'='itrust'
'itrust' is an anagram of 'turist'.
'turist' going around 'o' is 'TOURIST'.
'is' acts as a link.
(Other definitions for tourist that I've seen before include "One travels for pleasure" , "Holiday visitor" , "Sightseeing holidaymaker" , "someone on holiday" , "Tripper, sightseer" .)