The most common and most likely answer to this crossword clue is the 8 letter word SLOTTING
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Buddy explains!

The straight part
We know that "Scheduling" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case scheduling = slotting.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SLOTTING mean?
SLOTTING verb- To bar, bolt or lock a door or window.
- To shut with violence; to slam.
- To put something (such as a coin) into a slot (narrow aperture)
- To assign something or someone into a slot (gap in a schedule or sequence)
- To put something where it belongs.
- (Rhodesia, in the context of the Rhodesian Bush War) To kill.
- (Antarctica) To fall, or cause to fall, into a crevasse.
- Allocation to a slot