The most common and most likely answer to this crossword clue is the 8 letter word DETHRONE
D
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T
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O
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E
More clues leading to the result DETHRONE
- Queen needs him to carry the odd crown? No
- Bring down five hundred and three on slides
- Topple don with three rocks
- Bring down remote-controlled aircraft outside the ground
- Unseat tenor he’d recast
- Arrange to end her rule?
- From other end remove from position of authority
- Unseat King Herod violently around end of revolt by leaders of Naphtali eremites
- Overthrow ended with detention of the confused king
- Topple the high flyer outside
Buddy explains!

The straight part
We know that "Overthrow" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case overthrow = dethrone.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 DETHRONE mean?
DETHRONE verb- To depose; to forcibly relieve a monarch of the monarchy.
- To remove any governing authority from power.
- To remove from any position of high status or power.
- To remove (something) from a position of power or paramount importance.