Crossword Genius

A family related by blood (4)

Ross

I believe the answer is:

akin

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'related by blood' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for akin that I've seen before include "Related or similiar" , "Similar in quality" , "Close" , "Having similar characteristics" , "Related or similar - as a relative?" .)

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