The most common and most likely answer to this crossword clue is the 10 plus 7 letter word KEEP ONE’S COUNSEL
I've seen this crossword clue in The Guardian
K
E
E
P
Â
O
N
E
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™
S
C
O
U
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S
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L
Buddy explains!
The straight part
We know that "Retain barrister/refuse to speak" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case retain barrister/refuse to speak = keep one’s counsel.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.