Crossword Genius

We're all in this race (5)

Ross

I believe the answer is:

human

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

'we're all in this race' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'in this race' is the wordplay.
'in this' becomes 'hu' (I can't justify this - if you can you should give a lot more credence to this answer).
'race' becomes 'man' (I've seen this before).
'hu'+'man'='HUMAN'

Can you help me to learn more?

(Other definitions for human that I've seen before include "Being that's apt to err?" , "Like people" , "Anthropoid" , "Not divine, animal or mechanical" , "Like a real person" .)

I've seen this clue in the Evening Standard.
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