Young women from house of horror may be leading lights in cinema (10)

I believe the answer is:

usherettes

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'young women' is the definition.
The answer and definition can be both people as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for usherettes that I've seen before include "Guides" , "female escorts" .)

I've seen this clue in The Independent.

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