The most common and most likely answer to this crossword clue is the 9 letter word ETHNICITY
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Buddy explains!

The straight part
We know that "Race" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case race = ethnicity.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does ETHNICITY mean?
ETHNICITY noun- The common characteristics of a group of people, especially regarding ancestry, culture, language or national experiences.
- An ethnic group.
- (casual) Race; common ancestry.