Line of defence that makes lawyers angry (7)
I believe the answer is:
barrage
'line of defence that' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'lawyers angry' is the wordplay.
'lawyers' becomes 'bar' (the bar can mean the legal profession).
'angry' becomes 'rage' (I can't explain this - if you can you should give a lot more credence to this answer).
'bar'+'rage'='BARRAGE'
'makes' is the link.
Can you help me to learn more?
(Other definitions for barrage that I've seen before include "Heavy artillery fire" , "Prolonged artillery fire" , "Assault" , "a lot of shells" , "Sustained attack - means of damming river" .)