Crossword Genius

Inhuman boss (4)

Ross

I believe the answer is:

umbo

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

'boss' is the definition.
(the boss on a shield)

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

Can you help me to learn more?

(Another definition for umbo that I've seen is " Boss on a shield".)

I've seen this clue in The Globe and Mail.
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