The most common and most likely answer to this crossword clue is the 5 letter word BADGE
I've seen this crossword clue in Financial Times
B
A
D
G
E
More clues leading to the result BADGE
- Device damaging empty grate
- Star appearing in many westerns
- Mark ordered to secure grand opening
- I have a black and white coat shortened for Mark
- Token nocturnal animal having tail docked
- Emblem featuring tailless animal
- Mark‘s invited around midnight
- Wanting bit of rumpy-pumpy? Pester Mark!
- Seal — a nocturnal animal? Not right
- Mark woodland animal with no tail
Buddy explains!

The straight part
We know that "Mark" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mark = badge.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 BADGE mean?
BADGE noun- A distinctive mark, token, sign, emblem or cognizance, worn on one's clothing, as an insignia of some rank, or of the membership of an organization.
- A small nameplate, identifying the wearer, and often giving additional information.
- A card, sometimes with a barcode or magnetic strip, granting access to a certain area.
- Something characteristic; a mark; a token.
- (thieves' cant) A brand on the hand of a thief, etc.
- A carved ornament on the stern of a vessel, containing a window or the representation of one.
- A distinctive mark worn by servants, retainers, and followers of royalty or nobility, who, being beneath the rank of gentlemen, have no right to armorial bearings.
- A small overlay on an icon that shows additional information about that item, such as the number of new alerts or messages.
- An icon or emblem awarded to a user for some achievement.
- To mark or distinguish with a badge.
- To show a badge to.
- To enter a restricted area by showing one's badge.