The most common and most likely answer to this crossword clue is the 9 letter word FILMSTRIP
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Buddy explains!
The straight part
We know that "Material for slideshow maybe" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case material for slideshow maybe = filmstrip.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 FILMSTRIP mean?
FILMSTRIP noun- A length of film containing individual photographs or diagrams intended to be shown in sequence as instruction or as a visual aid.
- A file containing a sequence of images or video frames.