Crossword Genius

Crime centre – where to be edgy? (3)

Ross

I believe the answer is:

rim

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

'where to be edgy?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'crime centre' is the wordplay.
'centre' means to look at the middle letters.
The centre of 'crime' is 'RIM'.

Can you help me to learn more?

(Other definitions for rim that I've seen before include "Circular outer edge" , "Brim, edge" , "Edge, border" , "An edge, canyon or cup" , "Top edge" .)

I've seen this clue in the Evening Standard.
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