The most common and most likely answer to this crossword clue is the 10 letter word DEFINITELY
I've seen this crossword clue in The Guardian
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More clues leading to the result DEFINITELY
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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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What does DEFINITELY mean?
DEFINITELY adverb- Without question and beyond doubt.
- In a definite manner; decisively.