#VanityFair's star figure (5)

I believe the answer is:

sharp

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

'figure' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for sharp that I've seen before include "Acidic; pointed" , "exactly on time" , "Fly - biting" , "Punctually; raised note" , "Keen - exactly" .)

I've seen this clue in The Guardian.

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