The most common and most likely answer to this crossword clue is the 11 letter word ARTICULATED
I've seen this crossword clue in The Times
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More clues leading to the result ARTICULATED
Buddy explains!

The straight part
We know that "Spoke coherently/having a joint" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case spoke coherently/having a joint = articulated.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 ARTICULATED mean?
ARTICULATED verb- To make clear or effective.
- To speak clearly; to enunciate.
- To explain; to put into words; to make something specific.
- To bend or hinge something at intervals, or to allow or build something so that it can bend.
- To attack a note, as by tonguing, slurring, bowing, etc.
- To form a joint or connect by joints
- To treat or make terms.
- An articulated vehicle, such as a locomotive.
- Constructed with one or more pivoted joints which allow bending of an otherwise rigid structure.
- Of a vehicle, composed of component parts each with its own wheels and chassis, e.g. an articulated lorry, articulated bus, or certain kinds of streetcars and trains.