Cryptic crossword clue
Talks conveying a lot of sound lines 9

The most common and most likely answer to this crossword clue is the 9 letter word ORDINATES

I've seen this crossword clue in The Times
O
R
D
I
N
A
T
E
S


Buddy explains!

The straight part
We know that "lines" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lines = ordinates.
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 ORDINATES mean?

ORDINATES noun
  1. The second of the two terms by which a point is referred to, in a system of fixed rectilinear coordinate (Cartesian coordinate) axes.
  2. The vertical line representing an axis of a Cartesian coordinate system, on which the ordinate (sense above) is shown.
ORDINATES verb
  1. To ordain a priest, or consecrate a bishop
  2. To align a series of objects

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