Crossword Genius

With a better cut and inserting the right hair ornament (8)

Ross

I believe the answer is:

barrette

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

'hair ornament' is the definition.
(I know that barrette is a type of hair ornament)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for barrette that I've seen before include "Barnet's additional beauty" , "lock keeper" .)

I've seen this clue in the Evening Standard.
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