The most common and most likely answer to this crossword clue is the 6 letter word ACCEDE
I've seen this crossword clue in The Guardian
A
C
C
E
D
E
More clues leading to the result ACCEDE
- Set up last month, one goes round to give consent
- Agree about journalist being taken in by star
- Agree possible sequence of answers for 8, 9, 10 with five options
- Article initially consistent with grant to take office
- Allow European record company to be withdrawn
- Master presenter about to be engaged — agree?
- Agree it’s of small account and acquiesce
- Consent from top admitting Church doctrine’s first
- Agree to give up after a century
- Agree one is about a month in arrears
Buddy explains!

The straight part
We know that "Agree" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case agree = accede.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 ACCEDE mean?
ACCEDE verb- To approach; to arrive, to come forward.
- To give one's adhesion; to join up with (a group, etc.); to become part of.
- To agree or assent to a proposal or a view; to give way.
- To come to an office, state or dignity; to attain, assume (a position).
- To become a party to an agreement or a treaty.