The most common and most likely answer to this crossword clue is the 6 letter word VULGAR
I've seen this crossword clue in Financial Times
V
U
L
G
A
R
More clues leading to the result VULGAR
- Coarse east European taking Victor for British
- Common tease, darling turning back
- Coarse fish, with love, thrown back
- Former queen constraining Gaul, unruly, unrefined
- Crude newspaper; Liberal, upper-class, very revolting
- . Common // kind of fraction
- Coarse variety keeps swelling in the middle
- Old Queen caught posh gal acting common
Buddy explains!

The straight part
We know that "common" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case common = vulgar.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 VULGAR mean?
VULGAR noun- (classicism) A common, ordinary person.
- (collective) The common people.
- The vernacular tongue or common language of a country.
- Debased, uncouth, distasteful, obscene.
- (classical sense) Having to do with ordinary, common people.
- Common, usual; of the typical kind.