Cryptic crossword clue
It's still on the conference agenda? That's a physical impossibility 9,6

The most common and most likely answer to this crossword clue is the 9 plus 6 letter word PERPETUAL MOTION

I've seen this crossword clue in The Times
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Buddy explains!

The straight part
We know that "It's still on the conference agenda?/That's /a physical impossibility/" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it's still on the conference agenda?/that's /a physical impossibility/ = perpetual motion.
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.

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