The most common and most likely answer to this crossword clue is the 9 letter word CAMCORDER
I've seen this crossword clue in Independent
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Buddy explains!

The straight part
We know that "‘s line not acceptable for PM to hold (9)" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ‘s line not acceptable for pm to hold (9) = camcorder.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 CAMCORDER mean?
CAMCORDER noun- A portable electronic device for recording images and audio on to a storage device, hence functioning as a camera and a recorder in a single unit
- To record using a camcorder.