Cryptic crossword clue
  Fix hat before beginning to add fashion accessory 7,3

The most common and most likely answer to this crossword clue is the 7 plus 3 letter word FEATHER BOA

I've seen this crossword clue in Independent
F
E
A
T
H
E
R
B
O
A

Buddy explains!

The straight part
We know that "fashion accessory" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fashion accessory = feather boa.
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.

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