Crossword Genius

Actually existing skill, not fake primarily (2,4)

Ross

I believe the answer is:

in esse

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'fake primarily' is the definition.
The definition suggests an adjective which matches the answer.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for in esse that I've seen is " Really".)

I've seen this clue in The Hindu.
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