Artery (5)
'artery' is the definition.
(aorta is a kind of artery)
This is the entire clue.
(Other definitions for aorta that I've seen before include "Body's main artery" , "Main artery from heart" , "Main artery of body" , "Blood carrier" , "Main human artery" .)
(Other definitions for pasty that I've seen before include "Meat-filled pastry dish" , "Savoury turnover" , "Unhealthy-looking" , "Pallid" , "snack" .)
(Other definitions for ashen that I've seen before include "bleached" , "may be pale with shock" , "White" , "pasty" , "Visibly shocked" .)
(Other definitions for ruddy that I've seen before include "Red in the face (like a duck?)" , "Glowing pink" , "Reddish; -- duck" , "healthy-looking" , "Rubicund" .)
(Other definitions for joker that I've seen before include "trickster" , "Wild card" , "Funny man in pack" , "53rd card in the pack?" , "Comic; a card" .)
'artery' is the definition.
(renal artery is a kind of artery)
This is the entire clue.
(Other definitions for renal that I've seen before include "Concerning the kidneys" , "like kidneys" , "Relating to kidneys" , "connected with organ" , "using the reins" .)