Crossword Genius

The girl from downstairs with the bad knee? (9)

Ross

I believe the answer is:

housemaid

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

'the bad knee?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'the girl from downstairs' is the wordplay.
I cannot really understand how this works, but
'girl' could be 'ema' and 'ema' is present in the answer.
'from' could be 'o' (I've seen this in other clues) and 'o' is found in the answer.
This explanation may well be incorrect...

'with' is the link.

Can you help me to learn more?

(Other definitions for housemaid that I've seen before include "scrubber" , "Help" , "girl with bad knee?" , "menial role" .)

I've seen this clue in the Evening Standard.
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