Crossword Genius

First offence in Black Sea region? (6)

Ross

I believe the answer is:

crimea

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

This could be a double definition.

'first offence' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'black sea region?' is the second definition.
(I've seen this before)

'in' acts as a link.

Can you help me to learn more?

(Other definitions for crimea that I've seen before include "Disputed Black Sea peninsula" , "Where there was a battle" , "Peninsula in today's Ukraine, site of an 1853-6 war" , "Scene of the charge of the Light Brigade" , "old war zone" .)

I've seen this clue in The Sun.
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