The pictures may be a development of it (4)

I believe the answer is:

film

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

I cannot understand how the rest of the clue works.

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(Other definitions for film that I've seen before include "Skin" , "Flick" , "Shoot - thin layer" , "Moving picture" , "Thin covering or photographic medium (4)" .)

I've seen this clue in The Irish News.

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