What may cross boundaries for audience in particular way of writing? (5)

I believe the answer is:

style

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'way of writing?' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for style that I've seen before include "Cut dash" , "Particular kind, of fashion say" , "Pointed pen" , "Distinctive manner" , "Fashion - designation" .)

I've seen this clue in The Guardian.

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