The most common and most likely answer to this crossword clue is the 6 letter word TAMING
I've seen this crossword clue in The Times
T
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More clues leading to the result TAMING
Buddy explains!

The straight part
We know that "Overcoming" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case overcoming = taming.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 TAMING mean?
TAMING verb- To make (an animal) tame; to domesticate.
- To become tame or domesticated.
- To make gentle or meek.
- To broach or enter upon; to taste, as a liquor; to divide; to distribute; to deal out.
- The process by which a person, animal or thing is tamed.