Spooner delivers Trump/Brown nuclear deal (4,3)

I believe the answer is:

test ban

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'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?" .)

I've seen this clue in The Sunday Times and The Times.

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