Cryptic crossword clue
Unruly youth, first out of bed, with hairstyle changed to latest version 7

The most common and most likely answer to this crossword clue is the 7 letter word UPDATED

I've seen this crossword clue in The Guardian
U
P
D
A
T
E
D


Buddy explains!

The straight part
We know that "changed to latest version" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case changed to latest version = updated.
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 UPDATED mean?

UPDATED verb
  1. To bring (a thing) up to date.
  2. To bring (a person) up to date: to inform (a person) about recent developments.

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