Dishonest bloke stealing bread in vessel (7)
I believe the answer is:
carotid
'vessel' is the definition.
(carotid is a type of blood vessel)
'dishonest bloke stealing bread' is the wordplay.
'dishonest bloke' becomes 'cad' (I can't justify this - if you can you should believe this answer much more).
'stealing' is an insertion indicator.
'bread' becomes 'roti' (roti is a type of bread).
'cad' going around 'roti' is 'CAROTID'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for carotid that I've seen before include "Acid rot in major artery (7)" , "Major artery in neck" , "Relating to neck arteries" , "major arteries" .)