Crossword Genius

Nerd from southern Europe runs away (4)

Ross

I believe the answer is:

geek

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for geek that I've seen before include "anorak" , "Socially inept person" , "PC expert?" , "Nerd" , "PC fanatic?" .)

I've seen this clue in The Times.
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