Crossword Genius

Dad's brother Sam is in the US (5)

Ross

I believe the answer is:

uncle

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'dad's brother' 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?

(Other definitions for uncle that I've seen before include "Family relation" , "He's related" , "Pawnbroker (sl.)" , ". . . . . Sam, the US government" , "Male relative - pawnbroker" .)

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