The most common and most likely answer to this crossword clue is the 8 letter word SURCEASE
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More clues leading to the result SURCEASE
Buddy explains!

The straight part
We know that "In the past, stop" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in the past, stop = surcease.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 SURCEASE mean?
SURCEASE noun- Cessation; stop; end.
- To come to an end; to desist.
- To bring to an end.