The most common and most likely answer to this crossword clue is the 7 letter word UPSCALE
I've seen this crossword clue in The Times
U
P
S
C
A
L
E
Buddy explains!
The straight part
We know that "Tatler’s readers, perhaps" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case tatler’s readers, perhaps = upscale.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 UPSCALE mean?
UPSCALE verb- To increase in size, to scale up.
- Marked by wealth or quality; high-class; upmarket.