The most common and most likely answer to this crossword clue is the 10 letter word CORRESPOND
I've seen this crossword clue in The Daily Telegraph
C
O
R
R
E
S
P
O
N
D
More clues leading to the result CORRESPOND
- Agree to exchange letters
- Breaking hearts beginning to recover with mere email, say?
- Right to have Hearts crossing Atlantic for match
- Agree to modify drop scone recipe
- Agree to write?
- Agree to write
- Fit person moves in line
- Agree to provide answer after expression of surprise
- Agree to write
- Agree to keep in touch
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 CORRESPOND mean?
CORRESPOND verb- (constructed with to) To be equivalent or similar in character, quantity, quality, origin, structure, function etc.
- (constructed with with) to exchange messages, especially by postal letter, over a period of time.
- To have sex with.