The most common and most likely answer to this crossword clue is the 6 letter word VERBAL
V
E
R
B
A
L
More clues leading to the result VERBAL
- Like a word, however Balzac uses it
- Some of whatever Balzac’s expressed in words
- … said to be somewhat overbalanced
- Vicar returning to black tie event missing last bit of speech
- It’s said to be very short ’orticultural book
- Insult party and 17 Down upset
- Part of speech a student’s not written
- Uncommonly brave taking Latin oral
- It’s said some discover ballet…
- It’s said to be somewhat overbalanced
Buddy explains!

The straight part
We know that "unwritten" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case unwritten = verbal.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 VERBAL mean?
VERBAL noun- (grammar) A verb form which does not function as a predicate, or a word derived from a verb. In English, infinitives, participles and gerunds are verbals.
- A confession given to police.
- To induce into fabricating a confession.
- Of or relating to words.
- Concerned with the words, rather than the substance of a text.
- Consisting of words only.
- Expressly spoken rather than written; oral.
- (grammar) Derived from, or having the nature of a verb.
- (grammar) Used to form a verb.
- Capable of speech.
- Word for word.
- Abounding with words; verbose.