Cryptic crossword clue
With one weak card, holding busted flush; going 17 on that? 7,8

The most common and most likely answer to this crossword clue is the 7 plus 8 letter word WISHFUL THINKING

I've seen this crossword clue in Independent
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Buddy explains!

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.

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