Crossword Genius

Vessel taking a regular part in a circulatory system (7)

Ross

I believe the answer is:

jugular

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'vessel' is the definition.
(I know that jugular is a vein)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for jugular that I've seen before include "Vein (go for it!)" , "Large 24 in neck" , "Large vein in the neck" , "Type of 25" .)

I've seen this clue in the Evening Standard.
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