The most common and most likely answer to this crossword clue is the 14 letter word HELTER-SKELTER
I've seen this crossword clue in Independent
H
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More clues leading to the result HELTER-SKELTER
Buddy explains!
The straight part
We know that "Slide/headlong" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case slide/headlong = helter-skelter.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 HELTER-SKELTER mean?
HELTER-SKELTER noun- Confusion or turmoil
- A helical fairground slide
- Carelessly hurried and confused
- In confused, disorderly haste