Crossword Genius

Finally fired? (5,2)

Ross

I believe the answer is:

burnt up

I'm a little stuck... Click here to teach me more about this clue!

'finally fired?' is the definition.
Although both the answer and definition are past participle verbs, I cannot understand how they can define each other.

'fired?' is the wordplay.
I cannot really see how this works, but
'fired?' could be 'burnt' (I've seen this in another clue) and 'burnt' is found in the answer.
The remaining letters 'up' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for burnt up that I've seen is " Destroyed by fire".)

I've seen this clue in The Globe and Mail.
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