They harm translation with no vowels showing regular pattern (6)

I believe the answer is:

rhythm

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'pattern' is the definition.
(I have seen 'Sound pattern ' mean 'rhythm' so perhaps 'pattern' could also mean 'rhythm')

I can't explain the remainder of the clue.

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(Other definitions for rhythm that I've seen before include "Regular succesion of sounds" , "Musical or regular beat" , "Recurring beat" , "essence of some music?" , "(Musical) stress pattern" .)

I've seen this clue in The Daily Express.

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