The most common and most likely answer to this crossword clue is the 6 letter word ENDING
I've seen this crossword clue in The Guardian
E
N
D
I
N
G
More clues leading to the result ENDING
- Finish repair work Monsieur’s left
- About to happen, but not starting - far from it?
- Yielding after loss of leader: the final scene?
- Conclusion not yet decided, head of panel having left
- Completion for some broken dinghy
- Conclusion of election: extremists’ date in government
- Being inclined to ignore leader’s conclusion
- Conclusion, say, to cover news about investigator
- Finish letters from friend in Greece
- Putting a stop to what dog and pig do?
Buddy explains!

The straight part
We know that "Putting a stop to" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case putting a stop to = ending.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 ENDING mean?
ENDING noun- A termination or conclusion.
- The last part of something.
- (grammar) The last morpheme of a word, added to some base to make an inflected form (such as -ing in "ending").
- To come to an end
- To finish, terminate.