Crossword Genius

Nerdy Roman characters flee lunch, upsetting detective (5)

Ross

I believe the answer is:

unhip

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

'nerdy' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for unhip that I've seen before include "square" , "Not cool" , "uncool" .)

I've seen this clue in the Sydney Morning Herald.
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