Cryptic crossword clue
Initially retired, Michael Caine’s having to work: one goes over lines 9,5

The most common and most likely answer to this crossword clue is the 15 letter word VANISHING CREAM

I've seen this crossword clue in The Guardian
V
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M

Buddy explains!

The straight part
We know that "one goes over lines" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one goes over lines = vanishing cream.
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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