Visitor to university, gentleman turning up on time (7)
I believe the answer is:
tourist
'visitor' is the definition.
(thesaurus)
'to university gentleman turning up on time' is the wordplay.
'university' becomes 'u'.
'gentleman' becomes 'sir' (I've seen this before).
'turning up' says the letters should be written backwards.
'on' means one lot of letters go next to another.
'time' becomes 't'.
'sir' reversed gives 'ris'.
'to'+'u'+'ris'+'t'='TOURIST'
(Other definitions for tourist that I've seen before include "Someone who travels for pleasure" , "Traveller for pleasure" , "Sightseeing traveller" , "One travels for pleasure" , "Tripper, sightseer" .)