Western director screens short story — never mind (3,5)

I believe the answer is:

let alone

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'never mind' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for let alone that I've seen before include "Not to mention - much less - avoid" , "Don't touch" , "Not to mention (thing)" , "Not to mention, never mind" , "Don't bother someone - allow to be solitary" .)

I've seen this clue in The Guardian.

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