Promoted and praised GPO somewhat (13)

I believe the answer is:

propagandised

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'promoted and praised gpo somewhat' is the definition.
I can't judge whether this definition defines the answer.

'promoted and praised gpo somewhat' is the wordplay.
'and praised gpo' anagrams to 'PROPAGANDISED'.
Though, I'm not sure how this is indicated.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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