Crossword Genius

Finished being served by a houseworker (4,3)

Ross

I believe the answer is:

done for

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'finished' is the definition.
(done for can mean doomed or finished)

'served by a houseworker' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'one' and 'one' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

'being' is the link.

Can you help me to learn more?

(Other definitions for done for that I've seen before include "Dead - almost dead" , "condemned" , "close to death" , "killed" , "Ruined" .)

I've seen this clue in the Evening Standard.
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