The most common and most likely answer to this crossword clue is the 9 letter word ABDICATED
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The straight part
We know that "Abandoned" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case abandoned = abdicated.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 ABDICATED mean?
ABDICATED verb- To disclaim and expel from the family, as a father his child; to disown; to disinherit.
- To formally separate oneself from or to divest oneself of.
- To depose.
- To reject; to cast off; to discard.
- To surrender, renounce or relinquish, as sovereign power; to withdraw definitely from filling or exercising, as a high office, station, dignity; to fail to fulfill responsibility for.
- To relinquish or renounce a throne, or other high office or dignity; to renounce sovereignty.