Bloody Tube! Between two areas, nothing runs on time (5)

I believe the answer is:

aorta

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'bloody tube' is the definition.
'aorta' can be an answer for 'tube' (I've seen this before). I am not certain of the 'bloody' bit.

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

Can you help me to learn more?

(Other definitions for aorta that I've seen before include "Tube" , "Main artery of body" , "vital transporter" , "claret supplier" , "Principal artery" .)

I've seen this clue in The Independent.

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