Board accepts one satisfied schedule (9)
I believe the answer is:
timetable
'schedule' is the definition.
(timetable is a kind of schedule)
'board accepts one satisfied' is the wordplay.
'board' becomes 'table' ('table' can be a synonym of 'board').
'accepts' is an insertion indicator.
'one' becomes 'i' (Roman numeral).
'satisfied' becomes 'met' ('meet' can be a synonym of 'satisfy').
'i'+'met'='imet'
'table' enclosing 'imet' is 'TIMETABLE'.
(Other definitions for timetable that I've seen before include "Schedule of events" , "Syllabus" , "Programme" .)