Spooner delivers Trump/Brown nuclear deal (4,3)
I believe the answer is:
test ban
'deal' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for test ban that I've seen before include "Preclusion of H-bomb experimentation" , "Agreement on limiting nuclear research" , "Check on risky race" , "Prohibition on trying out atomic bombs" , "ignorant students might favour?" .)