Vessel located in cafeteria or tavern (5)
I believe the answer is:
aorta
'vessel' is the definition.
(blood vessel)
'located in cafeteria or tavern' is the wordplay.
'located in' says the answer is hidden in the clue.
'AORTA' can be found hidden inside 'cafeteria or tavern'.
(Other definitions for aorta that I've seen before include "blood flows from it" , "Bloody channel" , "Major blood vessel" , "Large trunk artery" , "vital transporter" .)