The most common and most likely answer to this crossword clue is the 4 plus 6 letter word WELL SPOKEN
I've seen this crossword clue in The Guardian
W
E
L
L
S
P
O
K
E
N
Buddy explains!
The straight part
We know that "expressed articulately" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case expressed articulately = well spoken.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 WELL SPOKEN mean?
WELL SPOKEN adjective- Eloquent and able with regards to speech.