Crossword Genius

I call Ray out, concerned with ethnicity (8)

Ross

I believe the answer is:

racially

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

'concerned with ethnicity' is the definition.
I can't tell whether this defines the answer.

'i call ray out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'i'+'call'+'ray'='icallray'
'icallray' is an anagram of 'RACIALLY'.

Can you help me to learn more?

(Another definition for racially that I've seen is " How folk may be grouped".)

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