Crossword Genius

Quarrel over some nuclear issue (4,3)

Ross

I believe the answer is:

fall out

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'quarrel' is the first definition.
(I know that fall out is a more specific form of the action quarrel)

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

'over' is the link.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.
Want a hint initially instead of a full solution? Install my app