Proudest drunk showed attitude (8)

I believe the answer is:

postured

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'showed attitude' is the definition.
The definition and answer can be both to do with perception as well as being past participle verbs.
Maybe there's an association between them I don't understand?

'proudest drunk' is the wordplay.
'drunk' indicates anagramming the letters.
'proudest' anagrammed gives 'POSTURED'.

Can you help me to learn more?

(Another definition for postured that I've seen is " Struck attitudes of proudest sort".)

I've seen this clue in The Times.

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