Excited when promoted after being sacked (5,2)

I believe the answer is:

fired up

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'excited' is the definition.
The definition and answer can be both to do with human feelings as well as being past participle verbs.
Perhaps they are linked in a way I don't understand?

'promoted after being sacked' is the wordplay.
'promoted' becomes 'up' (I've seen this in other clues).
'after' means one lot of letters go next to another.
'being sacked' becomes 'fired' (both can mean dismissed from a job).
'up' after 'fired' is 'FIRED UP'.

'when' acts as a link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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