Editor's mark (5)

I think it could be either:

Which length description are you looking for?:

caret

'editor's mark' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for caret that I've seen before include "Upward arrow mark" , "It shows what to put in" , "Proofreading sign for 'Insert'" , "Indicator of omission" , "this reveals something missing" .)

I've seen this clue in the Penny Press and the Newsday.

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