The most common and most likely answer to this crossword clue is the 6 letter word DISOWN
I've seen this crossword clue in Financial Times
D
I
S
O
W
N
More clues leading to the result DISOWN
- Refuse to acknowledge row about farm animal
- Reject racket broken by seed
- Reject row about producer of litter
- Daughter one's to have to abandon
- Deny row about broadcast
- Turn your back on litter-dropper during row
- Blue dressing is cut off
- Repudiate broadcast on dead Iranian leader
- Stop having contact with female involved in racket
- Deny any connection with row about female
Buddy explains!

The straight part
We know that "Repudiate" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case repudiate = disown.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 DISOWN mean?
DISOWN verb- To refuse to own, or to refuse to acknowledge one’s own.
- To repudiate any connection to; to renounce.
- To detach (a job or process) so that it can continue to run even when the user who launched it ends his/her login session.