The most common and most likely answer to this crossword clue is the 10 letter word VOICE-OVER
V
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Buddy explains!
The straight part
We know that "Commentary" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case commentary = voice-over.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 VOICE-OVER mean?
VOICE-OVER noun- A production technique, in which pictures are accompanied by the voice of an unseen actor or reporter.
- A voice-overed release, especially of foreign content.
- The voice audio track of such a broadcast.
- To supply the voice audio track for (a broadcast).