Begged for morning treat? (9,2,3)

I believe the answer is:

breakfast in bed

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'begged' is the definition.
The answer and definition are different parts of speech. However, adjectives and past participle verbs sometimes mean the same thing.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for breakfast in bed that I've seen is " Sunday morning treat?".)

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

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