The most common and most likely answer to this crossword clue is the 7 letter word ATTUNED
I've seen this crossword clue in The Times
A
T
T
U
N
E
D
More clues leading to the result ATTUNED
- Harmonised a duet not disregarding old fashions
- Bill absorbing temperature and air to get acclimatised
- A non-drinker, one in Paris, with editor, acclimatized
- Conditioned cask worried daughter carries
- US lawyer with a French degree initially on the ball?
- Accustomed to being wrongly taunted
- Taunted peculiar looking set
Buddy explains!

The straight part
We know that "on the ball" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case on the ball = attuned.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 ATTUNED mean?
ATTUNED verb- To bring into musical accord.
- To tune (an instrument).
- To bring into harmony or accord.
- (of a musical instrument) Tuned to the correct pitch.
- Brought into harmony; harmonized.
- Having been changed to fit in with a particular context or to be in sync with a phenomenon.