Crossword Genius

British females ignoring one? They are sharp (6)

Ross

I believe the answer is:

blades

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'british females' is the definition.
Although both the answer and definition are plural nouns, I cannot see how one could define the other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for blades that I've seen before include "Metal runners on skates" , "Knife edges or dashing fellows" , "Football club nickname" , "Cutting parts of knives" , "They cut" .)

I've seen this clue in The Guardian.
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