Prepare to publish a new diet (4)

I believe the answer is:

edit

'prepare to publish' is the definition.
(I've seen this before)

'a new diet' is the wordplay.
'a new' is an anagram indicator.
'diet' with letters rearranged gives 'EDIT'.

(Other definitions for edit that I've seen before include "Adjust text" , "Tide (anag.)" , "Prep for press" , "amend copy" , "Rework (text)" .)

I've seen this clue in the Evening Standard.

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