Crossword Genius

The golfer's arrogance (3)

Ross

I believe the answer is:

ego

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

'arrogance' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'the golfer's' is the wordplay.
'EGO' is hidden within the letters.
However, I'm unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for ego that I've seen before include "In Virgil I" , "Part of the mind" , "See 21 Down" , "number one" , "Inner self" .)

I've seen this clue in The Mirror.
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