Crossword Genius

Disagree over some nuclear issue (4,3)


I believe the answer is:

fall out

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This could be a double definition.

'disagree' is the first definition.
(I've seen this before)

'some nuclear issue' is the second definition.
'fall out' can be an answer for 'issue' (thesaurus). I am not certain of the 'some nuclear' bit.

'over' acts as a link.

Can you help me to learn more?

(Other definitions for fall out that I've seen before include "Radioactive pollution" , "disagree" , "Quarrel - leave the ranks" , "Happen" .)

I've seen this clue in the Evening Standard.
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