The most common and most likely answer to this crossword clue is the 13 letter word OVERBALANCING
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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.
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Crossword Answer definitions
OVERBALANCING verb- To throw (someone or something) off balance.
- To lose one's balance.
- To have an excess weight.
- To overcompensate.
- To exceed equality with; to outweigh.