Schedule American advance in vehicle (8)
I believe the answer is:
calendar
'schedule' is the definition.
(calendaring is a kind of scheduling)
'american advance in vehicle' is the wordplay.
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'advance' becomes 'lend' (I've seen this before).
'in' indicates putting letters inside.
'vehicle' becomes 'car' (car is a kind of vehicle).
'a'+'lend'='alend'
'alend' placed within 'car' is 'CALENDAR'.
(Other definitions for calendar that I've seen before include "Schedule" , "Chart of times" , "Year chart" , "Laden car (anag)" , "Table of months and days" .)