Crossword Genius

Englishwomen tailored gowns? It will surely be below the knee (7)

Ross

I believe the answer is:

hemline

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

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for hemline that I've seen before include "Level to which skirt hangs" , "Lower edge of a skirt" , "Lower end of garment" , "low level of fashion?" , "bottom of dressed" .)

I've seen this clue in The Hindu.
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