Crossword Genius

Part of the blood circulation system (4)

Ross

I believe the answer is:

vein

'part of the blood circulation system' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for vein that I've seen before include "Speaker's useless" , "Leaf rib; ore layer in rock" , "Vessel for claret" , "Deposit of mineral" , "Distinctive quality" .)

I've seen this clue in the Sydney Morning Herald.
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