The most common and most likely answer to this crossword clue is the 9 letter word ATTENTIVE
I've seen this crossword clue in Independent
A
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More clues leading to the result ATTENTIVE
Buddy explains!

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 ATTENTIVE mean?
ATTENTIVE adjective- Paying attention; noticing, watching, listening, or attending closely.
- Courteous; mindful.