Creating distortion, shapes triangulated (12)

I believe the answer is:

adulterating

'creating distortion' is the definition.

'shapes triangulated' is the wordplay.
'shapes' indicates an anagram (shape can mean to mould or transform).
'triangulated' with letters rearranged gives 'ADULTERATING'.

(Other definitions for adulterating that I've seen before include "Debasing" , "Making less pure" .)

I've seen this clue in The Guardian.

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