The most common and most likely answer to this crossword clue is the 10 letter word EPISTOLARY
E
P
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A
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More clues leading to the result EPISTOLARY
- Novel style of energy weapon — disintegrating ray
- Piece in each line of letters
- Is almost all poetry garbled like Dracula or The Secret Diary of Adrian Mole, aged 13 3/4?
- Relating to letters, early post sorted around one
- I post early version of letters
- 45 royalist nuts devoted to 20s
- Royal spite misguidedly revealed in letters
- Such a novel could produce pence in miserable royalties
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 EPISTOLARY mean?
EPISTOLARY noun- A Christian liturgical book containing set readings for church services from the New Testament Epistles.
- Of or relating to letters, or the writing of letters.
- Carried on by written correspondence.
- In the manner of written correspondence.