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Troublemaking female at uni totally demolished (3,2)

Ross

I believe the answer is:

ate up

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'totally demolished' is the definition.
Although both the answer and definition are past participle verbs, I cannot understand how one could define the other.

'troublemaking female at uni' is the wordplay.
I cannot really understand how this works, but
'at' is present in the answer.
'uni' could be 'u' (U is an abbreviation for university) and 'u' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for ate up that I've seen before include "preoccupied" , "Absorbed" , "Squandered" .)

I've seen this clue in The Times.
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