Crossword Genius

Copy a girl, sadly (4)

Ross

I believe the answer is:

alas

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'sadly' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for alas that I've seen before include "What a shame!" , "Regretfully!" , "Expression of grief/pity" , "Interjection of sorrow" , "Exclamation of misfortune" .)

I've seen this clue in the Evening Standard.
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