Somewhere out East in a coma (5)

I believe the answer is:

macao

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

'somewhere out east' is the definition.
The definition suggests a singular noun which matches the answer.

'a coma' is the wordplay.
'a coma' can be anagrammed to 'MACAO'.
But, I am not sure how this is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for macao that I've seen before include "Eastern city" , "Former Portuguese colony in China" , "Portuguese province" .)

I've seen this clue in the Evening Standard.

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