Gives further detail re last party; a setback (10)

I believe the answer is:

elaborates

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'gives further detail' is the definition.
I can't tell whether this defines the answer.

're last party a setback' is the wordplay.
're last' becomes 'e' (I can't explain this - if you can you should give a lot more credence to this answer).
'party' becomes 'labor' (Labor Party, Australian political party).
'setback' becomes 'tes' (I've seen this in other clues).
'e'+'labor'+'a'+'tes'='ELABORATES'

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

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