Crossword Genius

Quarrel about nuclear risk (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 clue might be a double definition.

'quarrel' is the first definition.
(I know that fall out is a type of quarrel)

'nuclear risk' is the second definition.
Although both the answer and definition are verbs in their base form, I cannot see how they can define each other.

'about' acts as a link.

Can you help me to learn more?

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

I've seen this clue in The Globe and Mail.
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