A type of stress (6)

I believe the answer is:

italic

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'a type' is the definition.
(kind of lettering)

I can't explain the rest of the clue.

(Other definitions for italic that I've seen before include "Letters written sloping to the right" , "A letter in sloping type" , "Relating to slanting handwriting or type" , "Latin is" , "kind of signing" .)

I've seen this clue in the Evening Standard.

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