Belched, thus upsetting a big-headed prude? (6)

I believe the answer is:

burped

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'belched' is the definition.
('burp' can be a synonym of 'belch')

I can't explain the remainder of the clue.

(Another definition for burped that I've seen is " Eructated like baby".)

I've seen this clue in the Evening Standard.

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