Crossword Genius

What the beggarly dog did late at night? (3,2)

Ross

I believe the answer is:

sat up

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'did late at night?' is the definition.
The answer and definition can be both related to bodily activities as well as being past participle verbs.
Maybe there's a link between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Another definition for sat up that I've seen is " Suddenly became alert".)

I've seen this clue in the Evening Standard.
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