The most common and most likely answer to this crossword clue is the 6 letter word PROLIX
I've seen this crossword clue in The Guardian
P
R
O
L
I
X
More clues leading to the result PROLIX
- Verbose professional listened to short musical phrases
- Verbose expert hearing short musical phrases
- Using many words for “59”?
- Long-winded argument in favour by learner, not quite ten
- Using many words and images, keeping part mostly concealed
- Verbose master, cross about student interrupting originally
- Expert solves reportedly taking too long
Buddy explains!

The straight part
We know that "Verbose" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case verbose = prolix.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 PROLIX mean?
PROLIX adjective- Tediously lengthy; dwelling on trivial details.
- Long; having great length.