Schedule for the enemy on board (9)
I believe the answer is:
timetable
'schedule' is the definition.
(timetable is a kind of schedule)
'the enemy on board' is the wordplay.
'the enemy' becomes 'time' (the enemy when speaking figuratively).
'on' says to put letters next to each other.
'board' becomes 'table' ('table' can be a synonym of 'board').
'time'+'table'='TIMETABLE'
'for' is the link.
(Other definitions for timetable that I've seen before include "Schedule of events" , "Syllabus" , "Programme" .)