Main artery (5)

I think it could be either:

Which length description are you looking for?:

5,4

aorta

'main artery' is the definition.
(largest artery)

This is all the clue.

(Other definitions for aorta that I've seen before include "This carries blood from the heart" , "Bloody channel" , "Main artery of body" , "A rota (anag)" , "Great artery in body" .)

I've seen this clue in the LA Times, The Times, the Evening Standard, The Telegraph, the USA Today, the Sydney Morning Herald, The Star Tribune, The Mirror, The Independent, the Penny Press, The Sun, the King Feature Syndicate and The New York Times.

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