Sanguine sort of group (5)

I believe the answer is:

blood

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'sanguine sort' is the definition.
'blood' can be an answer for 'sort' (thesaurus). I am not certain of the 'sanguine' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for blood that I've seen before include "Become the duty of" , "It's said to be thicker than water" , "Kinship; temperament" , "Gore" , "Descent, lineage" .)

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