Register a loan, taking vehicle around (8)
I believe the answer is:
calendar
'register' is the definition.
(thesaurus)
'a loan taking vehicle around' is the wordplay.
'loan' becomes 'lend' (synonyms).
'taking' is a charade indicator (letters next to each other).
'vehicle' becomes 'car' (car is a kind of vehicle).
'around' is an insertion indicator.
'a'+'lend'='alend'
'alend' going within 'car' is 'CALENDAR'.
(Other definitions for calendar that I've seen before include "that's stuffed with dates" , "List of dates of land race" , "Day/month chart" , "Chart showing seasons etc" , "Timetable" .)