Crossword Genius

Financially-maintained partner imprisoned? (4,5)

Ross

I believe the answer is:

kept woman

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

'financially-maintained partner imprisoned?' is the definition.
I can't tell whether this defines the answer.

'maintained partner imprisoned?' is the wordplay.
'maintained' becomes 'kept' ('keep' can be a synonym of 'maintain').
'partner' becomes 'w'.
'imprisoned?' becomes 'oman' (I can't explain this - if you can you should believe this answer much more).
'kept'+'w'+'oman'='KEPT WOMAN'

Can you help me to learn more?

(Other definitions for kept woman that I've seen before include "Mistress" , "Maintained female" .)

I've seen this clue in The Sun.
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