Crossword Genius

Cap for two women (7)

Ross

I believe the answer is:

patella

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'cap' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'two women' is the wordplay.
'two women' means two substitutions for 'woman'.
'woman' becomes 'pat' ().
'woman' becomes 'ella' (woman's name).
'pat'+'ella'='PATELLA'

'for' is the link.

Can you help me to learn more?

(Other definitions for patella that I've seen before include "A pallet (anag.)" , "showing a bit of leg" , "Kneecap (anatomy)" , "Knee bone" , "Joint cover" .)

I've seen this clue in The Daily Express and The Mirror.
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