The most common and most likely answer to this crossword clue is the 6 letter word NOTIFY
I've seen this crossword clue in Independent
N
O
T
I
F
Y
More clues leading to the result NOTIFY
- Inform if Tony is out of sorts
- Advise if Tony is spinning
- Tell anyone but me: frankly, content unnecessary
- Keep informed of tiny changes
- Brief attack on retreating Yankee
- Books provided in city alert
- Advise turning up healthy, in that case
- Inform, ___ but when
- Tell someone’s alter ego from yours at first sight
- Inform somebody else finally, being extremely selective
Buddy explains!

The straight part
We know that "Advise" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case advise = notify.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 NOTIFY mean?
NOTIFY verb- To give (someone) notice (of some event).
- To make (something) known.
- To make note of (something).