Cryptic crossword clue
In this you won’t find solutions for 21 down and 13 across 4,5,5

The most common and most likely answer to this crossword clue is the 10 plus 5 letter word WILD GOOSE CHASE

I've seen this crossword clue in The Guardian
W
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Buddy explains!

The straight part
We know that "In this you won’t find solutions for 21 down and 13 across" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in this you won’t find solutions for 21 down and 13 across = wild goose chase.
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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