Cryptic crossword clue
Everyone oddly insouciant following hot fantasies 14

The most common and most likely answer to this crossword clue is the 14 letter word HALLUCINATIONS

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

The straight part
We know that "fantasies" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fantasies = hallucinations.
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 HALLUCINATIONS mean?

HALLUCINATIONS noun
  1. A sensory perception of something that does not exist, often arising from disorder of the nervous system, as in delirium tremens; a delusion.
  2. The act of hallucinating; a wandering of the mind; an error, mistake or blunder.

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