Cryptic crossword clue
Youthful revellers wiped out after dropping one 4-9

The most common and most likely answer to this crossword clue is the 14 letter word WELL-PRESERVED

I've seen this crossword clue in Financial Times
W
E
L
L
-
P
R
E
S
E
R
V
E
D

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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.
Sadly, We don't have an explanation for this specific crossword clue yet.

Crossword Answer definitions

WELL-PRESERVED adjective
  1. (of an older person) healthy and ageing gracefully
  2. (of an old, possibly ancient, object) in good condition considering its age.

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