Blood carrier (4)

I believe the answer is:

vein

'blood carrier' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for vein that I've seen before include "Deposit of mineral" , "Part of the blood circulation system" , "Seam of mineral" , "Leaf rib; ore layer in rock" , "Distinctive style" .)

I've seen this clue in The Times and The Sunday Times.

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