What's left after following schedule is cut short?
I believe the answer is:
fag end
'what's left' is the definition.
(a fag end is what's left of a used cigarette)
'following schedule is cut short?' is the wordplay.
'following' becomes 'f' (used when citing page numbers etc).
'schedule' becomes 'agenda' ('agenda' can be a synonym of 'schedule').
'is cut short?' means to remove the last letter.
'agenda' with its final letter taken off is 'agend'.
'f'+'agend'='FAG-END'
'after' is the link.
(Other definitions for fag end that I've seen before include "Remnant" , "Butt - something picked up out of context" , "Useless bit" , "worthless piece" , "Cigarette butt, the last part" .)