The most common and most likely answer to this crossword clue is the 9 letter word OVERMATCH
I've seen this crossword clue in The Daily Telegraph
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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.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does OVERMATCH mean?
OVERMATCH noun- A match in which one opponent is greatly superior to the other.
- An opponent who is more than a match for another; one who cannot be defeated.
- To match more than intended.
- To be more than equal to or a match for, to surpass; hence, to conquer, vanquish.
- To marry to a superior.