Crossword Genius

... in which it helps to have this arrogance? (4-10)

Ross

I believe the answer is:

high-handedness

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

'arrogance?' is the definition.
(I've seen this before)

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

Can you help me to learn more?

I've seen this clue in The Telegraph.
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