Cryptic crossword clue
Being extravagant with jewellery all over uniform 6

The most common and most likely answer to this crossword clue is the 6 letter word BLUING

I've seen this crossword clue in The Guardian
B
L
U
I
N
G

Buddy explains!

The straight part
We know that "Being extravagant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case being extravagant = bluing.
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 BLUING mean?

BLUING verb
  1. To make or become blue.
  2. To treat the surface of steel so that it is passivated chemically and becomes more resistant to rust.
  3. (laundry) To brighten by treating with blue (laundry aid)
  4. To spend (money) extravagantly; to blow.
BLUING noun
  1. A substance used in laundry to whiten clothes; blue
  2. Any of several processes to protect steel against rust

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