Crossword Genius

Relative is mostly vague (5)

Ross

I believe the answer is:

uncle

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'relative' is the definition.
(I know that uncle is a type of kinsman)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for uncle that I've seen before include "one who's taken the pledge" , "Family relation" , "Brother of one's parent" , "older relative" , ". . . . . Sam, the US government" .)

I've seen this clue in The Mirror.
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