The most common and most likely answer to this crossword clue is the 4 letter word ARTY
I've seen this crossword clue in The Times
A
R
T
Y
More clues leading to the result ARTY
- Some bar types affecting interest in painting?
- Culturally pretentious leader dismissed by political group
- Affectedly cultured chap finally thrown out of do
- Pretentious political group lacking leader
- Affectedly aesthetic, heading away from party
- Aesthetic and robust? Not he
- Cultured person losing head
- . Interested in painting some of spectacular Tyrol
- Start off jolly pretentiously cultured
- Creative wake, say, to see off leader
Buddy explains!

The straight part
We know that "Aesthetic" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case aesthetic = arty.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 ARTY mean?
ARTY adjective- Pretending to artistic worth; high-flown.