Distort letters in a word processor (4)

I believe the answer is:

warp

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'distort' is the definition.
('warp' can be a synonym of 'distort')

I cannot understand how the remainder of the clue works.

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(Other definitions for warp that I've seen before include "Go out of shape" , "Crane fly larva" , "Buckle" , "Distort as wood may from heat" , "Pervert - lengthways threads" .)

I've seen this clue in the Evening Standard.

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