The most common and most likely answer to this crossword clue is the 10 letter word FILMSTRIPS
I've seen this crossword clue in The Guardian
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More clues leading to the result FILMSTRIPS
Buddy explains!

The straight part
We know that "series of pictures" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case series of pictures = filmstrips.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 FILMSTRIPS mean?
FILMSTRIPS 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.