The most common and most likely answer to this crossword clue is the 6 letter word MARQUE
I've seen this crossword clue in The Times
M
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More clues leading to the result MARQUE
Buddy explains!

The straight part
We know that "Brand" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case brand = marque.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 MARQUE mean?
MARQUE noun- A license to pass the limits of a jurisdiction, or boundary of a country, for the purpose of making reprisals; a letter of marque.
- A brand or make of a manufactured product, especially of a motor car (in contradistinction to a model).
- A ship commissioned for making captures.