Approbation (11)

I think it could be either:

Which length description are you looking for?:

endorsement

'approbation' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for endorsement that I've seen before include "Additional clause on a policy" , "Sanction, backing" , "drivers would prefer not to have?" , "Penalty appended to driving licence" , "Official backing" .)

I've seen this clue in The Independent.

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