Mark up article not consumed (8)

I believe the answer is:

annotate

'mark up' is the definition.

'article not consumed' is the wordplay.
'article' becomes 'an' (indefinite article).
'consumed' becomes 'ate' (eating is a kind of consuming).
'an'+'not'+'ate'='ANNOTATE'

(Other definitions for annotate that I've seen before include "Provide interlinear or marginal comments in a book" , "Supply explanatory notes" , "Write down comments on" , "Add explanations and comments to (a text)" , "Add notes to (text)" .)

I've seen this clue in The Guardian.

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