The most common and most likely answer to this crossword clue is the 6 letter word STYLES
I've seen this crossword clue in The Daily Telegraph
S
T
Y
L
E
S
More clues leading to the result STYLES
Buddy explains!

The straight part
We know that "Calls/tailors" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case calls/tailors = styles.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 STYLES mean?
STYLES noun- Senses relating to a thin, pointed object.
- (by extension from sense 1.1) A particular manner of expression in writing or speech, especially one regarded as good.
- A particular manner of creating, doing, or presenting something, especially a work of architecture or art.
- To design, fashion, make, or arrange in a certain way or form (style)
- To call or give a name or title to.
- To create for, or give to, someone a style, fashion, or image, particularly one which is regarded as attractive, tasteful, or trendy.
- To act in a way which seeks to show that one possesses style.